General Akrochordite InformationMn4Mg(AsO4)2(OH)4•4(H2O) |
Molecular Weight = 661.99 gm |
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Magnesium 3.67 % Mg 6.09 % MgO |
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Manganese 33.20 % Mn 42.86 % MnO |
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Arsenic 22.64 % As 34.72 % As2O5 |
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Hydrogen 1.83 % H 16.33 % H2O |
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Oxygen 38.67 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Mn2+4Mg(AsO4)2(OH)4•4(H2O) |
A rare mineral in hausmannite ore from a metamorphosed Fe-Mn orebody (Långban, Sweden); in a metamorphosed stratiform zinc orebody (Sterling Hill, New Jersey, USA). |
Valid Species (Pre-IMA) 1922 |
From Långban, Varmland, Sweden. At Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data. |
From the Greek for wart, for its typical habit. |
Akrochordite + Pronunciation |
ICSD 202938 |
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PDF 20-715 |
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Akrochordite Crystallographya:b:c =0.3223:1:0.3875 |
a = 5.682, b = 17.627, c = 6.832, Z = 2; beta = 99.49° V = 674.91 Den(Calc)= 3.26 |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c |
By Intensity(I/Io): 4.4(1), 8.79(0.8), 2.75(0.5), |
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| Physical Properties of Akrochordite{???} Good |
Reddish brown. |
3.19 - 3.26, Average = 3.22 |
Translucent |
3.5 - Copper Penny |
| Optical Properties of AkrochorditeCI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2077,KPDmeas= 0.2099,KC= 0.2084 Ncalc = 1.66 - 1.68 Biaxial (?), a=1.672, b=1.676, g=1.683, bire=0.0110 |
| Calculated Properties of AkrochorditeBulk Density (Electron Density)=3.13 gm/cc |
note: Specific Gravity of Akrochordite =3.26 gm/cc. Fermion Index = 0.0038598843 |
Boson Index = 0.9961401157 PEAkrochordite = 23.92 barns/electron |
U=PEAkrochordite x rElectron Density= 74.92 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Akrochordite is Not Radioactive | Akrochordite Classification42.04.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.04)where (AB)5 (XO4)2 Zq · x(H2O) |
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(42.04.01)Akrochordite Group |
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08.DD.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1 |
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| Other Akrochordite InformationNAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
Links to other databases for Akrochordite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Franklin Minerals(Dunn) 6 - GeoScienceWorld 7 - Google Images 8 - Google Scholar 9 - Handbook of Mineralogy (MinSocAm) 10 - Handbook of Mineralogy (UofA) 11 - MinDAT 12 - Mineralienatlas (Deutsch) 13 - Online Mineral Museum 14 - QUT Mineral Atlas 15 - Ruff.Info 16 - WWW-MINCRYST Search for Akrochordite using: Visit our Advertisers for Akrochordite : B and L Fine MineralsDakota Matrix Minerals Dan & Diana Weinrich Mineral Auctions Excalibur Mineral Corp. Exceptional Minerals John Betts Fine Minerals Mineral News Mineral of the Month Club NY/NJ Gem & Mineral Show TIMA Mineral Analyzer Weinrich Minerals, Inc. Wright's Rock Shop Ask about Akrochordite here : Print or Cut-and-Paste your Akrochordite Specimen Label here :
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