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Deanesmithite Mineral Data
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General Deanesmithite Information
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 Chemical Formula: |
Hg+2Hg++3Cr++++++O5S2 |
| Composition: |
Molecular Weight = 1,199.08 gm |
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Chromium 4.34 % Cr 8.34 % CrO3 |
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Mercury 83.64 % Hg 34.79 % Hg2O / 54.19 % HgO |
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Sulfur 5.35 % S 5.35 % S2- |
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- % S -2.67 % -O=S |
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Oxygen 6.67 % O |
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______ ______ |
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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 |
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Deanesmithite Image |
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Images:
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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 |
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Deanesmithite Crystallography
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| 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 - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 3.008(1), 5.72(0.9), 3.373(0.6), |
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Physical Properties of Deanesmithite
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| 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 |
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Optical Properties of Deanesmithite
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| Optical Data: |
Biaxial (?) |
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NCalc= 2.18 - from Gladstone-Dale relationship (KC = 0.1447) where Ncalc=Dcalc*KC+1
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
24.80 |
23.10 |
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| 420 nm |
25.20 |
23.10 |
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| 440 nm |
24.80 |
23.15 |
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| 460 nm |
23.80 |
23.30 |
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| 480 nm |
22.90 |
23.60 |
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| 500 nm |
22.10 |
23.80 |
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| 520 nm |
21.30 |
23.50 |
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| 540 nm |
20.50 |
22.90 |
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| 560 nm |
20.10 |
22.05 |
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| 580 nm |
20.00 |
21.70 |
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| 600 nm |
20.00 |
21.55 |
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| 620 nm |
19.90 |
21.30 |
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| 640 nm |
19.70 |
21.00 |
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| 660 nm |
19.60 |
20.80 |
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| 680 nm |
19.40 |
20.45 |
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| 700 nm |
19.25 |
20.30 |
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Calculated Relative Intensity Colors of Deanesmithite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
440% |
| R1 |
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| R2 |
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Calculated Properties of Deanesmithite
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| Electron Density: |
Bulk Density (Electron Density)=6.73 gm/cc
note: Specific Gravity of Deanesmithite =8.14 gm/cc.
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| Fermion Index: |
Fermion Index = 0.25
Boson Index = 0.75 |
| Photoelectric: |
PEDeanesmithite =1,432.52 barns/electron
U=PEDeanesmithite x rElectron Density=9,646.95 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Deanesmithite is Not Radioactive |
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Deanesmithite Classification
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| Dana Class: |
35.04.03.01 (35)Anhydrous Chromates |
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(35.04)with miscellaneous formulae |
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(35.04.03)Dana Group |
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35.04.03.01 Deanesmithite Hg2Hg3CrO5S2 P1 1 |
| Strunz Class: |
07.FB.20 07 - SULFATES (SELENATES, TELLURATES) |
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07.F - Chromates |
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07.FB -With additional O, V, S, Cl |
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07.FB.20 Deanesmithite Hg2Hg3CrO5S2 P1 1 |
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Other Deanesmithite Information
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| 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
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Deanesmithite
Hg+2Hg++3Cr++++++O5S2
Dana No: 35.04.03.01 Strunz No: 07.FB.20
Locality:
Notes:
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