Phoenicochroite Mineral Data

Phoenicochroite Mineral Data +

General Phoenicochroite Information

Chemical Formula:

Pb2(CrO4)O

Composition:

Molecular Weight = 546.39 gm

Chromium 9.52 % Cr 12.44 % CrO

Lead 75.84 % Pb 81.70 % PbO

Oxygen 14.64 % O

______ ______

100.00 % 94.14 % = TOTAL OXIDE

Empirical Formula:

Pb₂CrO₅

IMA Status:

Valid Species (Pre-IMA) 1839

Locality:

Beresov, Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "deep red" and "color", in allusion to the color

Synonym:

ICSD 34831

PDF 29-769

Phoenicochroite Image

Images:

Phoenicochroite

Comments: Deep red phoenicochroite with crocoite in matrix.
Location: Callenberg North (no. 1) open cut, Callenberg, Glauchau, Saxony, Germany. Scale: Picture size 6.5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Phoenicochroite Hemihedrite

Comments: Yellow hemihedrite crystals to 1 mm within pockets of dark red phoenicochroite crystalline aggregates on matrix.
Location: Pack Rat claim, Maricopa Co., Arizona, USA. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Phoenicochroite Crystallography

Axial Ratios:

a:b:c =2.4671:1:1.2576

Cell Dimensions:

a = 14.001, b = 5.675, c = 7.137, Z = 4; beta = 115.217° V = 513.03 Den(Calc)= 7.07

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.979(1), 3.38(1), 6.43(0.5),

Crystal Structure:

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Williams S A , McLean W J , Anthony J W , American Mineralogist , 55 (1970) p.784-792, A study of phoenicochroite - its structure and properties

Physical Properties of Phoenicochroite

Cleavage:

[201] Perfect

Color:

Dark red, Lemon yellow.

Density:

7.01

Diaphaniety:

Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luster:

Adamantine - Resinous

Streak:

yellow orange

Optical Properties of Phoenicochroite

Gladstone-Dale:

CI meas= -0.589 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.575 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2107,KPDmeas= 0.2126,KC= 0.1338

Optical Data:

Biaxial (+), a=2.38, b=2.44, g=2.65, bire=0.2700, 2V(Calc)=62, 2V(Meas)=58. Dispersion r > v strong.

Calculated Properties of Phoenicochroite

Electron Density:

r_electron=5.90 gm/cc
note: r_{Phoenicochroite}=7.07 gm/cc.

Fermion Index

Fermion Index = 0.17672
Boson Index = 0.82328

Photoelectric:

PE_{Phoenicochroite}=1,397.54 barns/electron
U=PE_{Phoenicochroite} x r_electron=8,246.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Phoenicochroite is Not Radioactive

Phoenicochroite Classification

Dana Class:

35.1.2.1 (35)Anhydrous Chromates

(35.1)where (A+)2 XO4

(35.1.2)Dana Group

35.1.2.1 Phoenicochroite Pb2(CrO4)O C 2/m 2/m

Strunz Class:

VI/F.02-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/F - Chromates [CrO4]2-

VI/F.02 - Wattersite - Satanaite series

VI/F.02-03 Wattersite Hg4HgCrO6 C 2/c 2/m

VI/F.02-05 Edoylerite Hg3CrO4S2 P 2₁/a 2/m

VI/F.02-07 Deanesmithite Hg2Hg3CrO5S2 P1 1

VI/F.02-10 Vauquelinite Pb2Cu(CrO4)(PO4)(OH) P 2₁/n 2/m

VI/F.02-20 Fornacite Pb2Cu(CrO4)(AsO4)(OH) P 2₁/c 2/m

VI/F.02-30 Molybdofornacite Pb2Cu[(As,P)O4][(Mo,Cr)O4](OH) P 2₁/c 2/m

VI/F.02-40 Phoenicochroite Pb2(CrO4)O C 2/m 2/m

VI/F.02-50 Santanaite Pb9Pb2CrO16 P 6₃22 6 2 2

Other Phoenicochroite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Phoenicochroite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Phoenicochroite

Pb2(CrO4)O
Dana No: 35.1.2.1 Strunz No: VI/F.02-40
Locality:

Notes: