Properties of Mica,Muscovite

				Stove Mica Isinglass

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Properties of Mica

Mechanical
Density:	Gr./Cu. Cm. · 2.6-3.2 Lb./Cu. Ft. · 160-200
Hardness, Mohs	2.0-3.2
Cleavage	Basal, Eminent
Crystal Structure	Monoclinic
Max. Temperature with no decomposition	400-500°C
Specific heat (25°C)	.206-.209
Thermal Conductivity perpendicular to cleavage:	Cal./Sq. Cm./Sec./Cm./°C · 16x10^-4 B.T.U./Sq. Ft./Hr./I.°F · 4.6
Coefficient of expansion per °C perpendicular to cleavage:	20° - 100° C · 15x10^-6 - 25x10^-6 100° - 300° C · 15x10^-6 - 25x10^-6 300° - 600° C · 16x10^-6 - 36x10^-6
Coefficient of expansion per °C parallel to cleavage:	0° - 200° C · 8x10^-6 - 9x10^-6 200° - 500° C · 10x10^-6 - 12x10^-6
Tensile strength, P.S.I.	37,000 - 43,000
Modulus of elasticity	25x10⁶
Electrical
Dielectric Constant	6.5 - 9
Dielectric Strength (highest qualities 1-3 mils thick), olts/Mil.	6,000 - 3,000
Power Factor at 25°C (77°F) (highest qualities), percent:	60 cycles · 0.08 - 0.09 1 megacycle · 0.01 - 0.02
Resistivity, Ohm-Cm.	10¹² - 10¹⁵
Optical
Optic axial angle (2V) degrees	38 - 47
Orientation of optic plane to plane of symmetry	Perpendicular
Indexes of refraction	Alfa · 1.552 - 1.570 ß · 1.582 - 1.607 Char · 1.588 - 1.611