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Andychristyite

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06119560014946270326407.jpg
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.


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Classification of AndychristyiteHide

Approved
Approval Year:
2015
First Published:
2016
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

Physical Properties of AndychristyiteHide

Adamantine
Transparency:
Transparent
Colour:
Bluish green
Streak:
very pale bluish green
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Density:
6.304 g/cm3 (Calculated)

Optical Data of AndychristyiteHide

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.

Chemical Properties of AndychristyiteHide

Formula:
PbCu2+Te6+O5(H2O)

Crystallography of AndychristyiteHide

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)°
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.71Å(16)
4.76Å(17)
3.274Å(100)
2.641Å(27)
2.434Å(23)
1.674Å(17)
1.588Å(21)
1.513Å(15)
Comments:
From Type Description.

Type Occurrence of AndychristyiteHide

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 AndychristyiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.CC.CobaltoblöditeNa2Co(SO4)2•4H2OMon. 2/m : P21/b
7.CC.Ammoniovoltaite(NH4)2Fe2+5Fe3+3Al(SO4)12(H2O)18Iso. m3m (4/m 3 2/m) : Fd3c
7.CC.05KrausiteKFe(SO4)2 · H2OMon. 2/m : P21/m
7.CC.10TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
7.CC.15KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
7.CC.15MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
7.CC.20Lonecreekite(NH4)Fe3+(SO4)2 · 12H2OIso.
7.CC.20Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20Alum-(Na)NaAl(SO4)2 · 12H2O
7.CC.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.20LanmuchangiteTl+Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3
7.CC.25VoltaiteK2Fe2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25ZincovoltaiteK2Zn5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.25PertlikiteK2(Fe2+,Mg)2Mg4Fe3+2Al(SO4)12 · 18H2OTet. 4/mmm (4/m 2/m 2/m) : I41/acd
7.CC.25Ammoniomagnesiovoltaite(NH4)2Mg2+5Fe3+3Al(SO4)12 · 18H2OIso. m3m (4/m 3 2/m) : Fd3c
7.CC.30KröhnkiteNa2Cu(SO4)2 · 2H2OMon. 2/m : P21/b
7.CC.35FerrinatriteNa3Fe(SO4)3 · 3H2OTrig. 3 : P3
7.CC.40GoldichiteKFe(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.45LöweiteNa12Mg7(SO4)13 · 15H2OTrig.
7.CC.50BlöditeNa2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.50NickelblöditeNa2(Ni,Mg)(SO4)2 · 4H2O
7.CC.50ChangoiteNa2Zn(SO4)2 · 4H2OMon. 2/m : P21/b
7.CC.55LeoniteK2Mg(SO4)2 · 4H2OMon. 2/m
7.CC.55MereiteriteK2Fe(SO4)2 · 4H2OMon.
7.CC.60Boussingaultite(NH4)2Mg(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60CyanochroiteK2Cu(SO4)2 · 6H2OMon. 2/m
7.CC.60Mohrite(NH4)2Fe(SO4)2 · 6H2OMon. 2/m : P21/b
7.CC.60Nickelboussingaultite(NH4)2Ni(SO4)2 · 6H2O
7.CC.60PicromeriteK2Mg(SO4)2 · 6H2OMon. 2/m
7.CC.65PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
7.CC.70LeightoniteK2Ca2Cu(SO4)4 · 2H2OTric.
7.CC.75AmarilliteNaFe(SO4)2 · 6H2OMon. 2/m : B2/b
7.CC.80KonyaiteNa2Mg(SO4)2 · 5H2OMon. 2/m : P21/b
7.CC.85WattevilleiteNa2Ca(SO4)2 · 4H2O (?)Orth.

Fluorescence of AndychristyiteHide

Other InformationHide

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.

References for AndychristyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Cooper, M.A., Mills, S.J., Housley, R.M. and Rossman, G.R. (2015) Andychristyite, IMA 2015-024. CNMNC Newsletter No. 26, August 2015, page 943; Mineralogical Magazine, 79, 941-947.
Kampf, A.R., Cooper, M.A., Mills, S.J., Housley, R.M., Rossman, G.R. (2016): Lead–tellurium oxysalts from Otto Mountain near Baker, California: XII. Andychristyite, PbCu2+Te6+O5(H2O), a new mineral with HCP stair-step layers. Mineralogical Magazine: 80: 1055–1065

Internet Links for AndychristyiteHide

Localities for AndychristyiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • California
    • San Bernardino Co.
      • Silver Lake Mining District
        • Soda Mts
          • Baker
            • Otto Mountain
Kampf, A.R., Cooper, M.A., Mills, S.J., Housley, R.M. and Rossman, G.R. (2015) Andychristyite, IMA 2015-024. CNMNC Newsletter No. 26, August 2015, page 943; Mineralogical Magazine, 79, 941-947; Kampf, A.R., Cooper, M.A., Mills, S.J., Housley, R.M., Rossman, G.R. (2016): Lead–tellurium oxysalts from Otto Mountain near Baker, California: XII. Andychristyite, PbCu2+Te6+O5(H2O), a new mineral with HCP stair-step layers. Mineralogical Magazine: 80: 1055–1065
 
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