Ulf Hålenius
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View article: Suenoite, □Mn<sub>2</sub>Mg<sub>5</sub>Si<sub>8</sub>O<sub>22</sub>(OH)<sub>2</sub>, a new member of the amphibole supergroup from the Scortico–Ravazzone ore deposit (Apuan Alps, Tuscany, Italy)
Suenoite, □Mn<sub>2</sub>Mg<sub>5</sub>Si<sub>8</sub>O<sub>22</sub>(OH)<sub>2</sub>, a new member of the amphibole supergroup from the Scortico–Ravazzone ore deposit (Apuan Alps, Tuscany, Italy) Open
Suenoite (IMA 2019-075), ideally □Mn2Mg5Si8O22(OH)2, is a new member of the amphibole supergroup discovered in the Mn ore deposit of Scortico–Ravazzone, Apuan Alps, Tuscany, Italy. It occurs as colourless tabular striated crystals, up to 0…
View article: Ferro-bosiite, NaFe <sup>3+</sup> <sub>3</sub> (Al <sub>4</sub> Fe <sup>2+</sup> <sub>2</sub> )(Si <sub>6</sub> O <sub>18</sub> )(BO <sub>3</sub> ) <sub>3</sub> (OH) <sub>3</sub> O, a new mineral species of the tourmaline supergroup
Ferro-bosiite, NaFe <sup>3+</sup> <sub>3</sub> (Al <sub>4</sub> Fe <sup>2+</sup> <sub>2</sub> )(Si <sub>6</sub> O <sub>18</sub> )(BO <sub>3</sub> ) <sub>3</sub> (OH) <sub>3</sub> O, a new mineral species of the tourmaline supergroup Open
Ferro-bosiite, NaFe 3+ 3 (Al 4 Fe 2+ 2 )(Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, is a new mineral of the tourmaline supergroup. It was found in a giant collapsed cavity discovered in the Marina granitic pegmatite, at the Mavuco locality, Alto Ligon…
View article: Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba island, Italy
Elbaite, the neotype material from the Rosina pegmatite, San Piero in Campo, Elba island, Italy Open
Elbaite, Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH), is a mineral species of the tourmaline supergroup. A formal description of the neotype elbaite material, approved by the International Mineralogical Association's Commission on New Mineral…
View article: Skogbyite, Zr(Mg<sub>2</sub>Mn<sup>3+</sup><sub>4</sub>)SiO<sub>12</sub>, a new zirconium mineral in the braunite group from Långban, Bergslagen, Sweden
Skogbyite, Zr(Mg<sub>2</sub>Mn<sup>3+</sup><sub>4</sub>)SiO<sub>12</sub>, a new zirconium mineral in the braunite group from Långban, Bergslagen, Sweden Open
Skogbyite, ideally Zr(Mg2Mn43+)SiO12, is a new mineral species (IMA 2023-085) within the braunite group, discovered in a complex metamorphic assemblage from the Långban Fe–Mn oxide deposit, Värmland County, Bergslagen ore province, Sweden.…
View article: Insights from the compositional evolution of a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite, Minas Gerais, Brazil
Insights from the compositional evolution of a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite, Minas Gerais, Brazil Open
This study compares the compositional evolution of a multi-coloured, zoned tourmaline crystal from the Cruzeiro pegmatite, Brazil, with the compositions of homogeneous tourmaline crystals systematically collected from the outer to the inne…
View article: Tourmaline as a petrogenetic indicator highlighted in a multicoloured crystal from the gem deposit of Mavuco, Alto Ligoña pegmatite district, NE Mozambique
Tourmaline as a petrogenetic indicator highlighted in a multicoloured crystal from the gem deposit of Mavuco, Alto Ligoña pegmatite district, NE Mozambique Open
A rounded fragment of a multicoloured tourmaline crystal (2.5 cm diameter), collected from the secondary gem deposit of Mavuco, Alto Ligoña pegmatite district, Mozambique, has been investigated using a multi-analytical approach, with the o…
View article: A brief comment on Hawthorne (2023): “On the definition of distinct mineral species: A critique of current IMA-CNMNC procedures”
A brief comment on Hawthorne (2023): “On the definition of distinct mineral species: A critique of current IMA-CNMNC procedures” Open
In this communication we present a brief response to Hawthorne (2023) who, in a paper in volume 87, doi.org/10.1180/mgm.2023.8 (this journal), claims evidence for violations of the electroneutrality principle in mineral formulae derived th…
View article: Mineralogical Society of the UK and Ireland
Mineralogical Society of the UK and Ireland Open
Applied study on Muttalip green clay
View article: Dark-coloured Mn-rich overgrowths in an elbaitic tourmaline crystal from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy: witness of late-stage opening of the geochemical system
Dark-coloured Mn-rich overgrowths in an elbaitic tourmaline crystal from the Rosina pegmatite, San Piero in Campo, Elba Island, Italy: witness of late-stage opening of the geochemical system Open
Multicoloured tourmalines from Elba Island, commonly display dark-coloured terminations due to incorporation of Fe, and also occasionally Mn. The mechanisms which led to the availability of these elements in the late-stage residual fluids …
View article: Piccoliite, NaCaMn<sup>3+</sup><sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>O(OH), a new arsenate from the manganese deposits of Montaldo di Mondovì and Valletta, Piedmont, Italy
Piccoliite, NaCaMn<sup>3+</sup><sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>O(OH), a new arsenate from the manganese deposits of Montaldo di Mondovì and Valletta, Piedmont, Italy Open
Piccoliite, ideally NaCaMn 3+ 2 (AsO 4 ) 2 O(OH), is a new mineral discovered in the Fe–Mn ore hosted in metaquartzites of the Montaldo di Mondovì mine, Corsaglia Valley, Cuneo Province, Piedmont, Italy. It occurs as small and rare black c…
View article: Schorl-1A from Langesundsfjord (Norway)
Schorl-1A from Langesundsfjord (Norway) Open
A crystal fragment of schorl from Langesundsfjord (Norway), showing a zonation with a biaxial optic behavior in the rim, was studied by electron microprobe analysis, single-crystal X-ray diffraction, Mössbauer, infrared and optical absorpt…
View article: New data on melanostibite, Mn<sub>2</sub>Fe<sup>3+</sup>Sb<sup>5+</sup>O<sub>6</sub>
New data on melanostibite, Mn<sub>2</sub>Fe<sup>3+</sup>Sb<sup>5+</sup>O<sub>6</sub> Open
Following the identification of a new occurrence of melanostibite from the Apuan Alps, the crystal chemistry of this mineral has been re-examined using specimens from its type locality, Sjögruvan, Örebro County, Sweden, and from the new oc…
View article: Blue growth zones caused by Fe<sup>2+</sup> in tourmaline crystals from the San Piero in Campo gem-bearing pegmatites, Elba Island, Italy
Blue growth zones caused by Fe<sup>2+</sup> in tourmaline crystals from the San Piero in Campo gem-bearing pegmatites, Elba Island, Italy Open
Two tourmaline crystals with a blue growth zone at the analogous pole, respectively from the San Silvestro and the Fucili pegmatites, located in the San Piero in Campo village, Elba Island (Tyrrhenian Sea, Italy), have been described for t…
View article: Uvite, CaMg<sub>3</sub>(Al<sub>5</sub>Mg)(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy
Uvite, CaMg<sub>3</sub>(Al<sub>5</sub>Mg)(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy Open
Uvite, CaMg 3 (Al 5 Mg)(Si 6 O 18 )(BO 3 ) 3 (OH) 3 (OH), is a new mineral of the tourmaline supergroup. It occurs in the Facciatoia quarry, San Piero in Campo, Elba Island, Italy (42°45′04.55″N, 10°12′50.89″E) at the centre of a narrow (2…
View article: As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: IV. Lombardoite, Ba<sub>2</sub>Mn<sup>3+</sup>(AsO<sub>4</sub>)<sub>2</sub>(OH) and aldomarinoite, Sr<sub>2</sub>Mn<sup>3+</sup>(AsO<sub>4</sub>)<sub>2</sub>(OH), description and crystal structure
As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: IV. Lombardoite, Ba<sub>2</sub>Mn<sup>3+</sup>(AsO<sub>4</sub>)<sub>2</sub>(OH) and aldomarinoite, Sr<sub>2</sub>Mn<sup>3+</sup>(AsO<sub>4</sub>)<sub>2</sub>(OH), description and crystal structure Open
Lombardoite, ideally Ba 2 Mn 3+ (AsO 4 ) 2 (OH), and aldomarinoite, ideally Sr 2 Mn 3+ (AsO 4 ) 2 (OH), are two new minerals of the arsenbrackebuschite group in the brackebuschite supergroup, discovered in Fe–Mn ore in metaquartzites of th…
View article: Lowering R3m Symmetry in Mg-Fe-Tourmalines: The Crystal Structures of Triclinic Schorl and Oxy-Dravite, and the Mineral luinaite-(OH) Discredited
Lowering R3m Symmetry in Mg-Fe-Tourmalines: The Crystal Structures of Triclinic Schorl and Oxy-Dravite, and the Mineral luinaite-(OH) Discredited Open
Discreditation of the monoclinic tourmaline mineral species luinaite-(OH), ideally (Na,▯)(Fe2+,Mg)3Al6(BO3)3Si6O18(OH)4 was approved by the IMA-CNMNC (proposal 21-L) and is described. We analyzed two luinaite-(OH) samples: one from the typ…
View article: Princivalleite, Na(Mn<sub>2</sub>Al)Al<sub>6</sub>(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy
Princivalleite, Na(Mn<sub>2</sub>Al)Al<sub>6</sub>(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>O, a new mineral species of the tourmaline supergroup from Veddasca Valley, Varese, Italy Open
Princivalleite, Na(Mn 2 Al)Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 O, is a new mineral (IMA2020-056) of the tourmaline supergroup. It occurs in the Veddasca Valley, Luino area, Varese, Lombardy, Italy (46°03’30.74’’N, 8°48’24.47’’E) at the centr…
View article: Bianchiniite, Ba<sub>2</sub>(Ti<sup>4+</sup>V<sup>3+</sup>)(As<sub>2</sub>O<sub>5</sub>)<sub>2</sub>OF, a new diarsenite mineral from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy
Bianchiniite, Ba<sub>2</sub>(Ti<sup>4+</sup>V<sup>3+</sup>)(As<sub>2</sub>O<sub>5</sub>)<sub>2</sub>OF, a new diarsenite mineral from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy Open
The new mineral bianchiniite, Ba 2 (Ti 4+ V 3+ )(As 2 O 5 ) 2 OF, has been discovered in the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy. It occurs as brown {001} tabular crystals, up to 1 mm across, with a vitreous lustre. It is britt…
View article: Mn-bearing purplish-red tourmaline from the Anjanabonoina pegmatite, Madagascar
Mn-bearing purplish-red tourmaline from the Anjanabonoina pegmatite, Madagascar Open
A gem-quality purplish-red tourmaline sample of alleged liddicoatitic composition from the Anjanabonoina pegmatite, Madagascar, has been fully characterised using a multi-analytical approach to define its crystal-chemical identity. Single-…
View article: Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite
Rüdlingerite, Mn2+2V5+As5+O7·2H2O, a New Species Isostructural with Fianelite Open
The new mineral species rüdlingerite, ideally Mn2+2V5+As5+O7·2H2O, occurs in the Fianel mine, in Val Ferrera, Grisons, Switzerland, a small Alpine metamorphic Mn deposit. It is associated with ansermetite and Fe oxyhydroxide in thin fractu…
View article: Vanadium-induced coloration in grossite (CaAl4O7) and hibonite (CaAl12O19)
Vanadium-induced coloration in grossite (CaAl4O7) and hibonite (CaAl12O19) Open
High concentrations of vanadium cause very unusual coloration in hibonite (purple) and grossite (light violet) crystals in an exotic mineral assemblage from Sierra de Comechingones (Argentina). In the hibonite (CaAl12O19) structure vanadiu…
View article: Heliophyllite: a discredited mineral species identical to ecdemite
Heliophyllite: a discredited mineral species identical to ecdemite Open
The type material for heliophyllite, preserved in the Swedish Museum of Natural History in Stockholm, was re-investigated through a combined EPMA (electron probe X-ray microanalysis), Raman, and X-ray powder diffraction (XRPD) and single-c…
View article: Nomenclature of the magnetoplumbite group
Nomenclature of the magnetoplumbite group Open
A nomenclature and classification scheme has been approved by IMA–CNMNC for the magnetoplumbite group, with the general formula A [ B 12 ]O 19 . The classification on the highest hierarchical level is decided by the dominant metal at the 1…
View article: Crystal Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). V. Scordariite, K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11: A New Metavoltine-Related Mineral
Crystal Chemistry of Sulfates from the Apuan Alps (Tuscany, Italy). V. Scordariite, K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11: A New Metavoltine-Related Mineral Open
The new mineral species scordariite, K8(Fe3+0.67□0.33)[Fe3+3O(SO4)6(H2O)3]2(H2O)11, was discovered in the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy. It occurs as pseudo-hexagonal tabular crystals, yellowish to brownish in color, up t…
View article: On the application of the IMA−CNMNC dominant-valency rule to complex mineral compositions
On the application of the IMA−CNMNC dominant-valency rule to complex mineral compositions Open
Mineral species should be identified by an end-member formula and by using the dominant-valency rule as recommended by the IMA–CNMNC. However, the dominant-end-member approach has also been used in the literature. These two approaches gene…
View article: IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47
IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47 Open
Closely related to markeyite Monoclinic: P2 1 /m; structure determined a = 17
View article: New minerals and nomenclature modifications approved in 2018 and 2019
New minerals and nomenclature modifications approved in 2018 and 2019 Open
peer reviewed