[Mineral Galleries] [About Me] [e-Bay Items] [Latest News] [How to Order] A Diverse Selection of Beautifully Unique Gem & Mineral Specimens Desert Winds Gems & Minerals • For All Levels of Collectors Worldwide Aesthetic & Rare Mineral Specimens • Regular Updates General Changoite InformationNa2Zn(SO4)2•4(H2O) |
Molecular Weight = 375.56 gm |
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Sodium 12.24 % Na 16.50 % Na2O |
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Zinc 17.41 % Zn 21.67 % ZnO |
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Hydrogen 2.15 % H 19.19 % H2O |
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Sulfur 17.08 % S 42.64 % SO3 |
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Oxygen 51.12 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Na2Zn(SO4)2•4(H2O) |
Found as a product of oxidation in an old mining area. The zinc-dominant analogue of blödite and nickelblödite. |
Approved IMA 1998 (Dana # Added) |
2 km west of Sierra Gorda, northeast of Antofagasta, northern Chile. Link to MinDat.org Location Data. |
Named after the changos, the early former inhabitants of northern Chile. |
IMA1997-041 |
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| | Changoite Crystallographya:b:c =1.3428:1:0.6706 |
a = 11.077, b = 8.249, c = 5.532, Z = 2; beta = 100.183° V = 497.52 Den(Calc)= 2.51 |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a |
By Intensity(I/Io): 3.289(1), 4.55(0.58), 3.262(0.35), |
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| Physical Properties of ChangoiteColorless. |
2.5 |
Transparent |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
Water Soluble - Water soluble mineral. |
Vitreous (Glassy) |
white |
| Optical Properties of ChangoiteCI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.204,KPDmeas= 0.2048,KC= 0.2063 Ncalc = 1.52 Biaxial (-), a=1.507, b=1.512, g=1.517, bire=0.0100 |
| Calculated Properties of ChangoiteBulk Density (Electron Density)=2.50 gm/cc |
note: Specific Gravity of Changoite =2.50 gm/cc. Fermion Index = 0.0086680282 |
Boson Index = 0.9913319718 PEChangoite = 9.60 barns/electron |
U=PEChangoite x rElectron Density= 24.03 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Changoite is Not Radioactive | Changoite Classification29.03.03.05 (29)Hydrated Acid and Sulfates |
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(29.03)where (A+)2 B (XO4)2 ˇ x(H2O) |
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(29.03.03)Blodite Group |
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07.CC.50 07 - SULFATES (SELENATES, TELLURATES) |
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07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O |
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07.CC -With medium-sized and large cations |
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| Other Changoite InformationNAME( CanMin 8/1999) PHYS. PROP.(AmMin, V84, p. 1685) OPTIC PROP.(MinRec) |
Links to other databases for Changoite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - Google Images 4 - Google Scholar 5 - Handbook of Mineralogy (MinSocAm) 6 - Handbook of Mineralogy (UofA) 7 - MinDAT 8 - MinMax(Deutsch) 9 - MinMax(English) 10 - Mineralienatlas (Deutsch) 11 - QUT Mineral Atlas 12 - Ruff.Info Search for Changoite using: Visit our Advertisers for Changoite : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Changoite Mineral Data : Ask about Changoite here : Print or Cut-and-Paste your Changoite Specimen Label here :
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