Silicon Mineral Data

Silicon Mineral Data +

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General Silicon Information

Chemical Formula:

Composition:

Molecular Weight = 28.09 gm

Silicon 100.00 % Si

______

100.00 %

Empirical Formula:

Environment:

Volcanic exhalations and minor inclusions in gold and other mantle-derived rocks. High purity synthetic material used in semiconductor manufacture.

IMA Status:

Approved IMA 1983

Locality:

Tolbachik, Kamchatka. Link to MinDat.org Location Data.

Name Origin:

From the Latin, silicis = "flint."

Synonym:

ICSD 60385

PDF 27-1402

Silicium

Silicon Image

Images:

Silicon Moissanite

Comments: Backscattered electron image of metallic inclusion in moissanite (SiC). The gray shading in the BSE mage consists mainly of pure silicon (Si metal). The brighter areas are composed of Fe-silicide. (AmMin, 88:1818).
Location: Found in a cobble at a beach along the Turkish coast of the Mediterranean Sea, around 150 km NW from Izmir, and is most likely derived from Tertiary volcanic rocks outcropping in the area. Scale: Scalebar 200 µ-m.
© American Mineralogist

Silicon Crystallography

Cell Dimensions:

a = 5.431, Z = 8; V = 160.19 Den(Calc)= 2.33

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 3.134(1), 1.917(0.5), 1.644(0.1),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Sample at T = 300 K

View Additional jPOWD Structure files for Silicon
[1]

Physical Properties of Silicon

Cleavage:

None

Color:

Iron black, Reddish brown.

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

7 - Quartz

Luster:

Metallic

Streak:

black

Calculated Properties of Silicon

Electron Density:

r_electron=2.32 gm/cc
note: r_Silicon=2.33 gm/cc.

Fermion Index

Fermion Index = 0.0467
Boson Index = 0.9533

Photoelectric:

PE_Silicon= 3.34 barns/electron
U=PE_Silicon x r_electron= 7.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Silicon is Not Radioactive

Silicon Classification

Dana Class:

1.3.7.1 (1)Native Elements

(1.3)with semi-metallic and non-metallic elements

(1.3.7)Dana Group

1.3.7.1 Silicon Si F d3m 4/m 3 2/m

Strunz Class:

I/B.05-10 I - Elements

I/B - Semimetals and nonmetals

I/B.05 - Silicon series

I/B.05-10 Silicon Si F d3m 4/m 3 2/m

Other Silicon Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

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Silicon

Si
Dana No: 1.3.7.1 Strunz No: I/B.05-10
Locality:

Notes: