Physical Properties of Ore Minerals

Table 7. Triclinic Crystal Class

Minerals are arranged alphabetically by space group (Schoenflies symbol).

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Mineral Name Composition Space Group Resistivity (ohm-m) Dielectric Permittivity Charge Separation Phenomena Curie Temp. °C Magnetic Properties k×10^-6cgs Optical Properties R % Comments
Gersdorffite (Ni,Co,Fe)AsS C₁¹ semiconductor
10^-6 to 1 pyroelectric
ferroelectric ?? <700 paramagnetic some anomalous anisotropism. 54.2 Also shown as cubic, space group T⁴.
Chalcophanite ZnMn₃O₇·3H₂O? C_i¹ ferroelectric ?? very strong pleochroism, extreme anisotropy and bireflectance, extreme birefringence. R_o-9.9
R_e-24.9 Optical effects compare with molybdenite and graphite.

Ore Minerals - 29 JAN 1997

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Mineral Name	Composition	Space Group	Resistivity (ohm-m)	Dielectric Permittivity	Charge Separation Phenomena	Curie Temp. °C	Magnetic Properties k×10^-6cgs	Optical Properties	R %	Comments
Gersdorffite	(Ni,Co,Fe)AsS	C₁¹	semiconductor 10^-6 to 1		pyroelectric ferroelectric ??	<700	paramagnetic	some anomalous anisotropism.	54.2	Also shown as cubic, space group T⁴.
Chalcophanite	ZnMn₃O₇·3H₂O?	C_i¹			ferroelectric ??			very strong pleochroism, extreme anisotropy and bireflectance, extreme birefringence.	R_o-9.9 R_e-24.9	Optical effects compare with molybdenite and graphite.