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Crocoite Mineral Data + |
General Crocoite Information |
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| PbCrO4 | |||
| Molecular Weight = 323.19 gm | |||
| Chromium 16.09 % Cr 30.94 % CrO3 | |||
| Lead 64.11 % Pb 69.06 % PbO | |||
| Oxygen 19.80 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| PbCrO4 | |||
| Secondary mineral of oxidized lead veins infiltrated by Cr bearing fluids.. | |||
| Valid Species (Pre-IMA) 1832 | |||
| Tasmania. Link to MinDat.org Location Data. | |||
| From the Greek krokos, meaning "crocus" or "saffron." | |||
| ICSD 24607 | |||
| PDF 8-209 | |||
| Red Lead Ore | |||
Crocoite Image | |||
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Crocoite Crystallography |
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| a:b:c =0.9569:1:0.9139 | |||
| a = 7.12, b = 7.44, c = 6.8, Z = 4; beta = 77.55° V = 351.74 Den(Calc)= 6.10 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n | |||
| By Intensity(I/Io): 3.28(1), 3.03(0.65), 3.48(0.55), | |||
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Mouse |
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Physical Properties of Crocoite |
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| [110] Distinct, [001] Indistinct, [100] Indistinct | |||
| Yellow, Orange, Red, Red orange. | |||
| 5.9 - 6.1, Average = 6 | |||
| Translucent | |||
| Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). | |||
| Acicular - Occurs as needle-like crystals. | |||
| Crystalline - Coarse - Occurs as well-formed coarse sized crystals. | |||
| Massive - Granular - Common texture observed in granite and other igneous rock. | |||
| 2.5-3 - Finger Nail-Calcite | |||
| None. | |||
| Adamantine | |||
| yellowish orange | |||
Optical Properties of Crocoite |
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| CI meas= -0.233 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.213 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2372,KPDmeas= 0.2411,KC= 0.1955 |
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| Biaxial (+), a=2.31, b=2.37, g=2.66, bire=0.3500, 2V(Calc)=54, 2V(Meas)=57. Dispersion none. | |||
| none. | |||
| none. | |||
| none. | |||
Calculated Properties of Crocoite |
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relectron=5.21 gm/cc |
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| Fermion Index = 0.15706 Boson Index = 0.84294 |
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PECrocoite =1,156.55 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Crocoite is Not Radioactive |
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Crocoite Classification |
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| 35.3.1.1 (35)Anhydrous Chromates | |||
| (35.3)where A+ XO4 | |||
| (35.3.1)Dana Group | |||
| VI/F.01-30 VI - Sulfates,Chromates,Molybdates and Tungstates | |||
| VI/F - Chromates [CrO4]2- | |||
| VI/F.01 - Tarapacaite - Crocoite series | |||
Other Crocoite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Crocoite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Glendale Community College 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (UofA) 11 - HyperPhysics 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 - Mineral and Gemstone Kingdom 16 -Mineralienatlas (Deutsch) 17 -QUT Mineral Atlas 18 - Tradeshop.com - The Rainbow of Gems 19 - WWW-MINCRYST 20 -École des Mines de Paris Search for Crocoite using: Visit our Advertisers for Crocoite : Translate Crocoite Mineral Data : Ask about Crocoite here : Print or Cut-and-Paste your Crocoite Specimen Label here :
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