Barrotite
A valid IMA mineral species
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About Barrotite
Formula:
Cu9Al(HSiO4)2[(SO4)(HAsO4)0.5](OH)12 · 8H2O
Colour:
Intense blue
Lustre:
Adamantine, Vitreous
Hardness:
2
Specific Gravity:
2.90
Crystal System:
Trigonal
Name:
Named for the Dôme du Barrot.
Unique Identifiers
Mindat ID:
43860
Long-form identifier:
mindat:1:1:43860:7
GUID
(UUID V4):
(UUID V4):
1ea4f453-69fe-4304-ad98-2bd122f09dc9
IMA Classification of Barrotite
Approved
IMA Formula:
Cu9Al(HSiO4)2[(SO4)(HAsO4)0.5](OH)12 · 8H2O
Approval year:
2011
First published:
2014
Classification of Barrotite
7.DE.45
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Bro | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Barrotite
Adamantine, Vitreous
Transparency:
Transparent, Translucent
Colour:
Intense blue
Streak:
Pale blue
Hardness:
2 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
Micaceous cleavage on (001)
Micaceous cleavage on (001)
Fracture:
Irregular/Uneven
Density:
2.90(2) g/cm3 (Measured) 2.977 g/cm3 (Calculated)
Optical Data of Barrotite
Type:
Uniaxial (-)
RI values:
nω = 1.652(2) nε = 1.576(2)
Max Birefringence:
δ = 0.076
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
ω=blue ε=light blue
Chemistry of Barrotite
Mindat Formula:
Cu9Al(HSiO4)2[(SO4)(HAsO4)0.5](OH)12 · 8H2O
Crystallography of Barrotite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Cell Parameters:
a = 10.650(2) Å, c = 21.954(7) Å
Ratio:
a:c = 1 : 2.061
Unit Cell V:
2156.5 ų
Z:
3
Morphology:
Hexagonal, tabular on (001). Forms {001} and {110}.
Twinning:
Twinning not observed.
Comment:
Space Group P31 or P32
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.34 Å | (100) |
3.670 Å | (90) |
2.645 Å | (90) |
2.587 Å | (30) |
2.396 Å | (25) |
2.278 Å | (15) |
1.537 Å | (50) |
1.331 Å | (20) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Barrotite
General Appearance of Type Material:
Perfect hexagonal plates of maximum size 0.5x0.02 mm or grouped in aggregates to 2 mm in size.
Place of Conservation of Type Material:
Aydin Adnan Menderes Üniversitesi, Memnune Inci Meslek Yüksek Okulu, Karacasu-Aydin, Turkey, specimen number KMY-26, and the Laboratory of Crystallography, University of Geneva, Switzerland, specimen number CR-011.
Geological Setting of Type Material:
In sandstone.
Associated Minerals at Type Locality:
Reference:
Sarp, H., Cerny, R., Puscharovsky, D.Yu., Schouwink, P., Teyssier, J., Williams, P.A., Babalik, H., Mari, G. (2014) La barrotite, Cu9Al(HSiO4)2[(SO4)(HAsO4)0.5](OH)12•8H2O, un nouveau minéral de la mine de Roua (Alpes-Maritimes, France). Riviera Scientifique: 98: 3-22.
Synonyms of Barrotite
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Barrotite associated with Connellite | Cu19(SO4)(OH)32Cl4 · 3H2O |
Related Minerals - Strunz-mindat Grouping
7.DE. | Cossaite | (Mg0.5,◻)Al6(SO4)6(HSO4)F6 · 36H2O |
7.DE. | Magnesioalterite | Mg2Fe3+4(SO4)4(C2O4)2(OH)4 · 17H2O |
7.DE. | Liangjunite | K2(Mo2O5)(SO4)2 · 3H2O |
7.DE. | Fabritzite | Zn9(SO4)2(OH)12Cl2 · 6H2O |
7.DE. | Downsite | K2(MoO3)3(SO4) · 4H2O |
7.DE.05 | Mangazeite | Al2(SO4)(OH)4 · 3H2O |
7.DE.10 | Carbonatecyanotrichite | Cu4Al2(CO3,SO4)(OH)12 · 2H2O |
7.DE.10 | Cyanotrichite | Cu4Al2(SO4)(OH)12 · 2H2O |
7.DE.10 | UKI-1975-(SO:AlCu) | (Cu, Al, SO4, H2O) |
7.DE.15 | Schwertmannite | Fe3+16(OH,SO4)12-13O16 · 10-12H2O |
7.DE.20 | Tlalocite | Cu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O |
7.DE.25 | Utahite | MgCu4Zn2Te6+3O14(OH)4 · 6H2O |
7.DE.35 | Coquandite | Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3) |
7.DE.40 | Osakaite | Zn4(SO4)(OH)6 · 5H2O |
7.DE.42 | Alterite | Zn2Fe3+4(SO4)4(C2O4)2(OH)4 · 17H2O |
7.DE.45 | Wilcoxite | MgAl(SO4)2F · 17H2O |
7.DE.47 | Tiberiobardiite | {Cu9Al[SiO3(OH)]2(OH)12(H2O)6}(SO4)1.5 · 10H2O |
7.DE.50 | Stanleyite | (V4+O)(SO4) · 6H2O |
7.DE.50 | Bouškaite | (MoO2)2O(SO3OH)2(H2O)4 |
7.DE.57 | Khangalasite | Fe(SO4)(OH) · 2H2O |
7.DE.60 | Hydrobasaluminite | Al4(SO4)(OH)10 · 12-36H2O |
7.DE.62 | Volaschioite | Fe4(SO4)O2(OH)6 · 2H2O |
7.DE.65 | Zaherite | Al12(SO4)5(OH)26 · 20H2O |
7.DE.75 | Camérolaite | Cu6Al3(OH)18(H2O)2[Sb(OH)6](SO4) |
Fluorescence of Barrotite
Not fluorescent.
Other Information
Notes:
Soluble in HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Barrotite
mindat.org URL:
https://www.mindat.org/min-43860.html
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References for Barrotite
Localities for Barrotite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
France | |
| Cahier de l'AFM N° 3 2017 |
| Williams et al. (2013) +1 other reference |
Norway | |
| Husdal (2021) |
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Mont-Roc Mine, Mont-Roc, Castres, Tarn, Occitanie, France