Andychristyite
A valid IMA mineral species
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About Andychristyite
Andrew G Christy
Formula:
PbCu2+Te6+O5(H2O)
Colour:
Bluish green
Lustre:
Adamantine
Hardness:
2 - 3
Specific Gravity:
6.304 (Calculated)
Crystal System:
Triclinic
Name:
The mineral is named for Andrew (Andy) Gregor Christy (b. 1963) a Welsh–Australian mineralogist, petrologist, geochemist, and solid-state chemist, for his contributions to mineralogy, in particular, for the description of the new minerals (kapundaite, mössbauerite, mojaveite, bluebellite and favreauite), his work on minerals of the sapphirine supergroup, pyrochlore supergroup and hydrotalcite supergroup, and more recently for helping advance the knowledge of the crystal chemistry of tellurium.
New structure type. Chemically related to housleyite, khinite, paratimrosite, and timroseite. Structurally related to bairdite, eckhardite, paratimroseite, and timroseite.
Crystal structure details: stair-step-like hcp layers built of TeO6 and CuO6 octahedra || {001}; the layers are linked with Pb in the [001] direction.
Crystal structure details: stair-step-like hcp layers built of TeO6 and CuO6 octahedra || {001}; the layers are linked with Pb in the [001] direction.
Unique Identifiers
Mindat ID:
46681
Long-form identifier:
mindat:1:1:46681:3
GUID
(UUID V4):
(UUID V4):
1baa57ef-98d1-4942-8b88-c74b1291f74c
IMA Classification of Andychristyite
Classification of Andychristyite
7.CC.
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
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 |
|---|---|---|
| Acs | 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 Andychristyite
Adamantine
Transparency:
Transparent
Colour:
Bluish green
Streak:
very pale bluish green
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
{001}
Fracture:
Irregular/Uneven
Density:
6.304 g/cm3 (Calculated)
Optical Data of Andychristyite
Type:
Biaxial
Dispersion:
Strong
Pleochroism:
Visible
Comments:
very pale blue green to medium blue green
Comments:
2V large, Gladstone–Dale relationship predicts an average index of refraction of 2.011.
Chemistry of Andychristyite
Mindat Formula:
PbCu2+Te6+O5(H2O)
Crystallography of Andychristyite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.322(3) Å, b = 7.098(4) Å, c = 7.511(4) Å
α = 83.486(7)°, β = 76.279(5)°, γ = 70.742(5)°
α = 83.486(7)°, β = 76.279(5)°, γ = 70.742(5)°
Ratio:
a:b:c = 0.75 : 1 : 1.058
Unit Cell V:
260 ų
Z:
2
Morphology:
tabular crystals to ca. 50 μm, forming sub-parallel aggregates
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.71 Å | (16) |
| 4.76 Å | (17) |
| 3.274 Å | (100) |
| 2.641 Å | (27) |
| 2.434 Å | (23) |
| 1.674 Å | (17) |
| 1.588 Å | (21) |
| 1.513 Å | (15) |
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] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Andychristyite
General Appearance of Type Material:
bluish-green tablets flattened on {001}, up to about 50 μm across
Place of Conservation of Type Material:
Type material is deposited in the collections of the Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA, catalogue number 65577
Geological Setting of Type Material:
a secondary oxidation zone mineral and is presumed to have formed by oxidation of earlier formed tellurides, chalcopyrite, and galena
Associated Minerals at Type Locality:
Synonyms of Andychristyite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 7.CC. | Cobaltoblödite | Na2Co(SO4)2 · 4H2O |
| 7.CC. | Ammoniovoltaite | (NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18 |
| 7.CC.05 | Krausite | KFe(SO4)2 · H2O |
| 7.CC.10 | Tamarugite | NaAl(SO4)2 · 6H2O |
| 7.CC.15 | Kalinite | KAl(SO4)2 · 11H2O |
| 7.CC.15 | Mendozite | NaAl(SO4)2 · 11H2O |
| 7.CC.20 | Lonecreekite | (NH4)Fe3+(SO4)2 · 12H2O |
| 7.CC.20 | Alum-(K) | KAl(SO4)2 · 12H2O |
| 7.CC.20 | Alum-(Na) | NaAl(SO4)2 · 12H2O |
| 7.CC.20 | Tschermigite | (NH4)Al(SO4)2 · 12H2O |
| 7.CC.20 | Lanmuchangite | Tl+Al(SO4)2 · 12H2O |
| 7.CC.25 | Voltaite | K2Fe2+5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.25 | Zincovoltaite | K2Zn5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.25 | Pertlikite | K2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2O |
| 7.CC.25 | Ammoniomagnesiovoltaite | (NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.25 | Magnesiovoltaite | K2Mg5Fe3+3Al(SO4)12 · 18H2O |
| 7.CC.30 | Kröhnkite | Na2Cu(SO4)2 · 2H2O |
| 7.CC.35 | Ferrinatrite | Na3Fe(SO4)3 · 3H2O |
| 7.CC.40 | Goldichite | KFe(SO4)2 · 4H2O |
| 7.CC.45 | Löweite | Na12Mg7(SO4)13 · 15H2O |
| 7.CC.50 | Blödite | Na2Mg(SO4)2 · 4H2O |
| 7.CC.50 | Nickelblödite | Na2(Ni,Mg)(SO4)2 · 4H2O |
| 7.CC.50 | Changoite | Na2Zn(SO4)2 · 4H2O |
| 7.CC.55 | Leonite | K2Mg(SO4)2 · 4H2O |
| 7.CC.55 | Mereiterite | K2Fe(SO4)2 · 4H2O |
| 7.CC.60 | Boussingaultite | (NH4)2Mg(SO4)2 · 6H2O |
| 7.CC.60 | Cyanochroite | K2Cu(SO4)2 · 6H2O |
| 7.CC.60 | Mohrite | (NH4)2Fe(SO4)2 · 6H2O |
| 7.CC.60 | Nickelboussingaultite | (NH4)2Ni(SO4)2 · 6H2O |
| 7.CC.60 | Picromerite | K2Mg(SO4)2 · 6H2O |
| 7.CC.60 | Nickelpicromerite | K2Ni(SO4)2 · 6H2O |
| 7.CC.60 | Katerinopoulosite | (NH4)2Zn(SO4)2 · 6H2O |
| 7.CC.65 | Polyhalite | K2Ca2Mg(SO4)4 · 2H2O |
| 7.CC.70 | Leightonite | K2Ca2Cu(SO4)4 · 2H2O |
| 7.CC.75 | Amarillite | NaFe(SO4)2 · 6H2O |
| 7.CC.80 | Konyaite | Na2Mg(SO4)2 · 5H2O |
| 7.CC.85 | Wattevilleite | Na2Ca(SO4)2 · 4H2O (?) |
| 7.CC.85 | Xocolatlite | Ca2Mn4+2(Te6+O6)2 · H2O |
| 7.CC.90 | Eckhardite | (Ca,Pb)Cu2+Te6+O5(H2O) |
Fluorescence of Andychristyite
none
Other Information
Notes:
decompose rapidly in dilute HCl at room temperature.
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 Andychristyite
mindat.org URL:
https://www.mindat.org/min-46681.html
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References for Andychristyite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter 26. Mineralogical Magazine, 79 (4) 941-947 doi:10.1180/minmag.2015.079.4.05
Kampf, Anthony R., Cooper, Mark A., Mills, Stuart J., Housley, Robert M., Rossman, George R. (2016) Lead-tellurium oxysalts from Otto Mountain near Baker, California, USA: XII. Andychristyite, PbCu2+Te6+O5(H2O), a new mineral with hcp stair-step layers. Mineralogical Magazine, 80 (6) 1055-1065 doi:10.1180/minmag.2016.080.042
Localities for Andychristyite
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.
USA | |
| Anthony R Kampf |
| Mineralogical Magazine +2 other references |
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Empire Mine, Tombstone Mining District, Cochise County, Arizona, USA