Grandviewite
A valid IMA mineral species
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About Grandviewite
Formula:
Cu3Al2(SO4)(OH)10 · H2O
originally assumed to be Cu3Al9(SO4)2(OH)29
Colour:
Turquoise-blue, greenish pale blue
Lustre:
Silky
Hardness:
2
Specific Gravity:
2.72 (Calculated)
Crystal System:
Triclinic
Name:
Named after the type locality.
Type material shows greenish blue (rosasite-like) sprays of acicular crystals, grown on a chalcoalumite layer, which covers a mixture of cyanotrichite and visually indistinguishable carbonatecyanotrichite. Also grown directly on cyanotrichite.
Redefined by IMA in 2021 as a hydrated copper–aluminum hydroxy-sulfate.
Redefined by IMA in 2021 as a hydrated copper–aluminum hydroxy-sulfate.
Unique Identifiers
Mindat ID:
31588
Long-form identifier:
mindat:1:1:31588:3
GUID
(UUID V4):
(UUID V4):
dee71203-3cc2-4f29-a84a-e1e30a1fd4bf
IMA Classification of Grandviewite
Approved
IMA status notes:
Redefined by the IMA
Approval year:
2007
First published:
2008
Approval history:
2021: Redefined by IMA (IMA 21-K)
Classification of Grandviewite
7.BB.60
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
B : With medium-sized cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
B : Sulfates (selenates, etc.) with additional anions, without H2O
B : With medium-sized cations
30.1.19.
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
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 |
|---|---|---|
| Gvw | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Grandviewite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Grandviewite
Silky
Colour:
Turquoise-blue, greenish pale blue
Streak:
Very pale blue.
Hardness:
2 on Mohs scale
Tenacity:
Sectile
Cleavage:
Perfect
On {100} or {001}
On {100} or {001}
Fracture:
Irregular/Uneven
Density:
2.72 g/cm3 (Calculated)
Optical Data of Grandviewite
Type:
Biaxial (-)
RI values:
nα = 1.590(4) nβ = 1.625(4) nγ = 1.645(4)
2V:
Calculated: 72°
Max Birefringence:
δ = 0.055
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
Optical Extinction:
Y = b, Z approximately parallel to elongation.
Pleochroism:
Strong
Comments:
Z = pale blue-green, Y = very pale yellow, X = very pale yellow.
Chemistry of Grandviewite
Mindat Formula:
Cu3Al2(SO4)(OH)10 · H2O
originally assumed to be Cu3Al9(SO4)2(OH)29
originally assumed to be Cu3Al9(SO4)2(OH)29
Crystallography of Grandviewite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
b = 10.1374(8) Å, c = 10.9791(9) Å
α = 72.240(6)°, β = 82.79(2)°, γ = 86.07(2)°
α = 72.240(6)°, β = 82.79(2)°, γ = 86.07(2)°
Ratio:
a:b:c = 1 : 1.083
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Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Flattened, acicular crystals.
Comment:
Redefinition by IMA propsal IMA 21-K, CNMNC Newsletter 65 from Grandview mine
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.667 Å | (33) |
| 6.208 Å | (100) |
| 5.287 Å | (35) |
| 3.949 Å | (79) |
| 3.625 Å | (10) |
| 2.990 Å | (9) |
| 2.816 Å | (14) |
| 2.721 Å | (8) |
| 2.413 Å | (9) |
| 2.019 Å | (8) |
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] |
Type Occurrence of Grandviewite
General Appearance of Type Material:
Radiating sprays of extremely acicular laths, up to 0.5 mm in length and about 2 µm thick. Individual crystals are of the order of 0.1 µm thick
Place of Conservation of Type Material:
Geosciences Department, Museum Victoria, Melbourne, Australia, M50490.
Geological Setting of Type Material:
Secondary mineral in Cu deposit.
Associated Minerals at Type Locality:
Synonyms of Grandviewite
Other Language Names for Grandviewite
German:Grandviewit
Common Associates
Associated Minerals Based on Photo Data:
| 40 photos of Grandviewite associated with Chalcoalumite | CuAl4(SO4)(OH)12 · 3H2O |
| 38 photos of Grandviewite associated with Brochantite | Cu4(SO4)(OH)6 |
| 32 photos of Grandviewite associated with Cyanotrichite | Cu4Al2(SO4)(OH)12 · 2H2O |
| 3 photos of Grandviewite associated with Metazeunerite | Cu(UO2)2(AsO4)2 · 8H2O |
| 2 photos of Grandviewite associated with Gypsum | CaSO4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 7.BB. | Brumadoite | Cu3(Te6+O4)(OH)4 · 5H2O |
| 7.BB. | Iskandarovite | Sb6O7(SO4)2 |
| 7.BB. | Novikovite | (NH4)4Mo6+2Mo5+2O8(SO4)5 |
| 7.BB.10 | Hauckite | Fe3+3(Mg,Mn2+)24Zn18(SO4)4(CO3)2(OH)81 |
| 7.BB.15 | Antlerite | Cu3(SO4)(OH)4 |
| 7.BB.20 | Dolerophanite | Cu2(SO4)O |
| 7.BB.25 | Brochantite | Cu4(SO4)(OH)6 |
| 7.BB.25 | Ramaccioniite | Cu4[SeO4](OH)6 |
| 7.BB.30 | Vergasovaite | Cu3(SO4)(MoO4,SO4)O |
| 7.BB.30 | Cupromolybdite | Cu3O(MoO4)2 |
| 7.BB.35 | Klebelsbergite | Sb4O4(SO4)(OH)2 |
| 7.BB.35 | Tavagnascoite | Bi4O4(SO4)(OH)2 |
| 7.BB.40 | Schuetteite | Hg2+3(SO4)O2 |
| 7.BB.45 | Paraotwayite | Ni(OH)2-x(SO4,CO3)0.5x |
| 7.BB.50 | Xocomecatlite | Cu3(TeO4)(OH)4 |
| 7.BB.55 | Pauflerite | (V4+O)SO4 |
| 7.BB.65 | Timroseite | Pb2Cu5(TeO6)2(OH)2 |
| 7.BB.70 | Glikinite | Zn3O(SO4)2 |
| 7.BB.80 | Mojaveite | Cu6[Te6+O4(OH)2](OH)7Cl |
| 7.BB.85 | Paratimroseite | Pb2Cu4(TeO6)2(H2O)2 |
Other Information
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 Grandviewite
mindat.org URL:
https://www.mindat.org/min-31588.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Grandviewite
Reference List:
forum.amiminerals.it (n.d.) http://forum.amiminerals.it/viewtopic.php?f=5&t=17941&sid=ddac7db0e6e8b0b0cdb73f5aaecc2ba6
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65. European Journal of Mineralogy, 34 (1) 143-148 doi:10.5194/ejm-34-143-2022
Localities for Grandviewite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Argentina | |
| Hubert Putz (EDS- and PXRD-analysed, will be published) +1 other reference |
| Marquez-Zavalia et al. (2020) | |
| Marquez-Zavalia et al. (2020) | |
Greece | |
| no description given yet] +1 other reference |
| Rieck et al. (2018) |
USA (TL) | |
| Australian J. Mineralogy 14 (2) |
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Capillitas mining district, Andalgalá Department, Catamarca Province, Argentina