Mineralogy Database

Crocoite Mineral Data

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General Crocoite Information

Help on Chemical  Formula: Chemical Formula: PbCrO4
Help on Composition: Composition: 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
Help on Empirical Formula: Empirical Formula: PbCrO4
Help on Environment: Environment: Secondary mineral of oxidized lead veins infiltrated by Cr bearing fluids..
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1832
Help on Locality: Locality: Tasmania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek krokos, meaning "crocus" or "saffron."
Help on Name Pronunciation: Name Pronunciation: Crocoite Say CROCOITE
Help on Synonym: Synonym: Bellite - a mixture of quartz, mimetite and crocoite, or simply Cr-bearing mimetite
  ICSD 24607
  PDF 8-209
  Red Lead Ore

Crocoite Image

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Comments: Prismatic crystals of red-orange crocoite.
Location: Adelaide Mine, Dundas, Tasmania. Scale: Specimen size 5 cm.
© Dave Barthelmy

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  Vauquelinite   Crocoite

Comments: Olive-greenish vauquelinite encrusting red crocoite.
Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

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  Coronadite   Crocoite

Comments: Black coronadite with red crocoite on matrix.
Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Specimen size 7 cm.
© Thomas Witzke / Abraxas-Verlag

Crocoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9569:1:0.9139
Help on Cell Dimensions: Cell Dimensions: a = 7.12, b = 7.44, c = 6.8, Z = 4; beta = 77.55° V = 351.74 Den(Calc)= 6.10
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.28(1), 3.03(0.65), 3.48(0.55),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 0 1) ( 1 1 0) ( 1 1 1) ( 0 0 1)

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Physical Properties of Crocoite

Help on Cleavage: Cleavage: {110} Distinct, {001} Indistinct, {100} Indistinct
Help on Color: Color: Yellow, Orange, Red, Red orange.
Help on Density: Density: 5.9 - 6.1, Average = 6
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: yellowish orange

Optical Properties of Crocoite

Help on Gladstone-Dale: Gladstone-Dale: 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
Ncalc = 2.15 - 2.19
Help on Optical Data: Optical Data: Biaxial (+), a=2.31, b=2.37, g=2.66, bire=0.3500, 2V(Calc)=54, 2V(Meas)=57. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.

Calculated Properties of Crocoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.21 gm/cc
note: Specific Gravity of Crocoite =6.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.15
Boson Index = 0.85
Help on Photoelectric: Photoelectric: PECrocoite =1,156.55 barns/electron
U=PECrocoite x rElectron Density=6,024.79 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Crocoite is Not Radioactive

Crocoite Classification

Help on  Dana Class: Dana Class: (35)Anhydrous Chromates
  (35.03)where A+ XO4
  (35.03.01)Dana Group Crocoite PbCrO4 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 07.FA.20 07 - SULFATES (SELENATES, TELLURATES)
  07.F - Chromates
  07.FA -Without additional anions
07.FA.20 Crocoite PbCrO4 P 21/n 2/m

Other Crocoite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Crocoite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - HyperPhysics
13 - MinDAT
14 - Mineral and Gemstone Kingdom
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - Tradeshop.com - The Rainbow of Gems

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Dana No: Strunz No: 07.FA.20





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