Deanesmithite Mineral Data

Deanesmithite Mineral Data +

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General Deanesmithite Information

Chemical Formula:

Hg+2Hg++3Cr++++++O5S2

Composition:

Molecular Weight = 1,199.08 gm

Chromium 4.34 % Cr 8.34 % CrO₃

Mercury 83.64 % Hg 34.79 % Hg₂O / 54.19 % HgO

Sulfur 5.35 % S 5.35 % S^2-

- % S -2.67 % -O=S

Oxygen 6.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Hg₂Hg₃CrO₅S₂

Environment:

Very rare in a mercury deposit in silicate-carbonate rock hydrothermally altered from serpentine.

IMA Status:

Approved IMA 1993

Locality:

Clear Creek claim, near the Clear Creek mercury mine, New Idria district, San Benito County, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Deane K. Smith (1930-2001), Pennsylvania State University, University Park, Pennsylvania, USA.

Synonym:

IMA1991-001

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Deanesmithite Crystallography

Axial Ratios:

a:b:c =0.8542:1:0.7252

Cell Dimensions:

a = 8.116, b = 9.501, c = 6.891, Z = 2; alpha = 100.43°, beta = 110.24°, gamma = 82.8° V = 486.45 Den(Calc)= 8.19

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.008(1), 5.72(0.9), 3.373(0.6),

Crystal Structure:

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Szymanski J T , Groat L A , The Canadian Mineralogist , 35 (1997) p.765-772, The crystal structure of deanesmithite, Hg2Hg3CrO5S2

Physical Properties of Deanesmithite

Cleavage:

[110] Good, [001] Fair

Color:

Orange red.

Diaphaniety:

Transparent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4.5-5 - Near Apatite

Luster:

Adamantine

Streak:

orange red

Optical Properties of Deanesmithite

Optical Data:

Biaxial (?)

Pleochroism (x):

weak orange yellow.

Pleochroism (z):

dark reddish orange.

RL Bireflectance:

Weak.

RL Color:

Dark bluish gray to pale gray with bright yellow-orange internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Deanesmithite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	24.80	23.10
420 nm	25.20	23.10
440 nm	24.80	23.15
460 nm	23.80	23.30
480 nm	22.90	23.60
500 nm	22.10	23.80
520 nm	21.30	23.50
540 nm	20.50	22.90
560 nm	20.10	22.05
580 nm	20.00	21.70
600 nm	20.00	21.55
620 nm	19.90	21.30
640 nm	19.70	21.00
660 nm	19.60	20.80
680 nm	19.40	20.45
700 nm	19.25	20.30

**Calculated Relative Intensity Colors of Deanesmithite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%	440%
R₁
R₂

Calculated Properties of Deanesmithite

Electron Density:

r_electron=6.78 gm/cc
note: r_{Deanesmithite}=8.19 gm/cc.

Fermion Index

Fermion Index = 0.25715
Boson Index = 0.74285

Photoelectric:

PE_{Deanesmithite}=1,432.52 barns/electron
U=PE_{Deanesmithite} x r_electron=9,706.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Deanesmithite is Not Radioactive

Deanesmithite Classification

Dana Class:

35.4.3.1 (35)Anhydrous Chromates

(35.4)with miscellaneous formulae

(35.4.3)Dana Group

35.4.3.1 Deanesmithite Hg2Hg3CrO5S2 P1 1

Strunz Class:

VI/F.02-07 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 Deanesmithite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(AntBidBlaNic5)

See Also:

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

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Deanesmithite

Hg+2Hg++3Cr++++++O5S2
Dana No: 35.4.3.1 Strunz No: VI/F.02-07
Locality:

Notes: