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Arrojadite Mineral Data |
General Arrojadite Information |
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KNa4CaMn++4Fe++10Al(PO4)12(OH,F)2 | ||
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Molecular Weight = 2,151.01 gm | ||
Potassium 1.82 % K 2.19 % K2O | |||
Sodium 4.28 % Na 5.76 % Na2O | |||
Calcium 1.86 % Ca 2.61 % CaO | |||
Manganese 10.22 % Mn 13.19 % MnO | |||
Aluminum 1.25 % Al 2.37 % Al2O3 | |||
Iron 25.96 % Fe 33.40 % FeO | |||
Phosphorus 17.28 % P 39.59 % P2O5 | |||
Hydrogen 0.07 % H 0.63 % H2O | |||
Oxygen 36.82 % O | |||
Fluorine 0.44 % F 0.44 % F | |||
- % F -0.19 % -O=F2 | |||
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100.00 % 100.00 % = TOTAL OXIDE | |||
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KNa4CaMn2+4Fe2+10Al(PO4)12(OH)1.5F0.5 | ||
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Occurs at a high temperature (approx. 800 degrees C) primary mineral in granite pegmatites. Now is the series name. | ||
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Renamed IMA 2005, Dana # changed from 41.7.2.1 | ||
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In Brazil, from the Sierra Branca pegmatite, 13 km south of Pedra Lavrada, Picui, Paraiba; in the Enio pegmatite mine, northeast of Galileia, and the Sapucaia pegmatite mine, about 50 Link to MinDat.org Location Data. | ||
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To honor Miguel Arrojado Ribeiro Lisboa (1872-1932), Brazilian geologist. Arrojadite {1925) is renamed arrojadite-(KFe) and arrojadite becomes the group name. | ||
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Arrojadite + Pronunciation ![]() |
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ICSD 100872 | ||
PDF 34-149 | |||
Arrojadite Image | |||
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Arrojadite Crystallography |
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a:b:c =1.6444:1:2.4612 | ||
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a = 16.537, b = 10.056, c = 24.75, Z = 4; beta = 105.65° V = 3,963.24 Den(Calc)= 3.60 | ||
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Monoclinic - Domatic H-M Symbol (m) Space Group: Cc | ||
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By Intensity(I/Io): 3.042(1), 2.714(0.85), 3.222(0.45), | ||
Physical Properties of Arrojadite |
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{001} Distinct | ||
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Olive green, Clove brown, Yellow. | ||
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3.56 | ||
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Translucent | ||
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Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments. | ||
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5 - Apatite | ||
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Vitreous - Greasy | ||
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green gray | ||
Optical Properties of Arrojadite |
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CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.186,KPDmeas= 0.1881,KC= 0.1892 Ncalc = 1.67 - 1.68 |
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Biaxial (+), a=1.664, b=1.67, g=1.675, bire=0.0110, 2V(Calc)=84, 2V(Meas)=86. | ||
Calculated Properties of Arrojadite |
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Bulk Density (Electron Density)=3.44 gm/cc note: Specific Gravity of Arrojadite =3.56 gm/cc. |
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Fermion Index = 0.0057083688 Boson Index = 0.9942916312 |
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PEArrojadite = 11.79 barns/electron U=PEArrojadite x relectron= 40.52 barns/cc. |
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GRapi = 25.32 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Arrojadite |
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Arrojadite Classification |
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41.07.02a.00 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen | ||
(41.07)where (A B)m (XO4)4 Zq | |||
(41.07.02a)Arrojadite Group (Arrojadite Subgroup) (Al in Al site, OH in W site, Fe in M site) | |||
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08.BF.05 08 - PHOSPHATES, ARSENATES, VANADATES | ||
08.B - Phosphates, etc. with Additional Anions, without H2O | |||
08.BF -With medium-sized and large cations, (OH, etc.):RO4 < 0.5:1 | |||
Other Arrojadite Information |
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NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Arrojadite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - CalTech Mineral Spectroscopy 4 - EUROmin Project 5 - Ecole des Mines de Paris 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 Arrojadite using: Visit our Advertisers for Arrojadite : Ask about Arrojadite here : Print or Cut-and-Paste your Arrojadite Specimen Label here :
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