Deanesmithite Mineral Data

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.

Name Pronunciation:

Deanesmithite + Pronunciation

Synonym:

IMA1991-001

Deanesmithite Image

Images:

Deanesmithite

Comments: SEM image showing several crystals of deanesmithite protruding from matrix. (CanMin v31:787).
Location: Small prospect pit near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, Califomia, USA. Scale: Scale Bar 40 µm.
© Canadian Mineralogist

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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.

Diaphaneity:

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 (?)

NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1447) where Ncalc=Dcalc*KC+1

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:

Bulk Density (Electron Density)=6.73 gm/cc
note: Specific Gravity of Deanesmithite =8.14 gm/cc.

Fermion Index:

Fermion Index = 0.25
Boson Index = 0.75

Photoelectric:

PE_{Deanesmithite}=1,432.52 barns/electron
U=PE_{Deanesmithite} x rElectron Density=9,646.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Deanesmithite is Not Radioactive

Deanesmithite Classification

Dana Class:

35.04.03.01 (35)Anhydrous Chromates

(35.04)with miscellaneous formulae

(35.04.03)Dana Group

35.04.03.01 Deanesmithite Hg2Hg3CrO5S2 P1 1

Strunz Class:

07.FB.20 07 - SULFATES (SELENATES, TELLURATES)

07.F - Chromates

07.FB -With additional O, V, S, Cl

07.FB.20 Deanesmithite Hg2Hg3CrO5S2 P1 1

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Deanesmithite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Deanesmithite :

A Bijoux Google Search for Deanesmithite
Adam's Minerals Google Search for Deanesmithite
Cape Minerals Google Search for Deanesmithite
Dakota Matrix Minerals Google Search for Deanesmithite
Excalibur Mineral Corp. Google Search for Deanesmithite
Exceptional Minerals Google Search for Deanesmithite
John Betts Fine Minerals Search for Deanesmithite
McDougall Minerals Google Search for Deanesmithite
Mineral News Website Link
Rock and Mineral Shows Google Search for Deanesmithite
Weinrich Minerals, Inc. Google Search for Deanesmithite

Ask about Deanesmithite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Deanesmithite Specimen Label here :

Deanesmithite

Hg+2Hg++3Cr++++++O5S2
Dana No: 35.04.03.01 Strunz No: 07.FB.20
Locality:

Notes: