Magnesiacummingtonite-Grunerite

[Chemical composition] Mg-Fe is completely homogeneous, with some substitution of Mn. Al is often used in the Mg-rich end elements instead of Si, and a very small amount of Ca can be substituted.

[Crystal structure] monoclinic system; a ₀ = 0.950 to 0.956 nm, b ₀ = 1.796 to 1.845 nm, c ₀ = 0.530 to 0.534 nm; β = 109 ° 34'; Z = 2.

[Form] The crystal is acicular, fibrous, or a fibrous aggregate. Common simplex has oblique columns {011}, {110}, and parallel double-sided {010}. According to (100) there is a polycrystalline twin crystal. The fibrous variant is called iron asbestos .

[Physical properties] Dark green to brown, as the Fe ²⁺ content in the composition increases, the color becomes darker; the glass is glossy, translucent to transparent. The cleave {110} is completely angled at 125° and 55°. The hardness is 5-6, and the relative density is 3.10-3.60.

[Cause amphibolite and amphibole occurrence Mg, Fe] is mainly produced in the deterioration in the region formed with the amphibole symbiosis. In schist leptite often coexist with hornblende and plagioclase. Magnesia amphibole is an earlier mineral formed in metamorphic rocks. It can often be included with orthopyroxene. A green common hornblende can be seen at the edge of the magnesite.

[identification characteristics] morphology, cleavage, color, produced in regional metamorphic rocks and chip rocks.

[Main use] See the Asbestos family asbestos.

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