Anthophylite

(Mg,Fe) 7 [Si 4 O 11 ] 2 (OH) 2

[Chemical composition] Natural pure magnesium endmembers have not been reported.

[Crystal structure] orthorhombic system; 360 screenshot 20170722094029361 a 0 = 1.850 to 1.860 nm, b 0 = 1.771 to 1.810 nm, c 0 = 0.527 to 0.523 nm; Z = 4.

[Form] Crystals are often columnar and plate-shaped, and the common simplex is {210}, {100}, {001}. Fibrous amphibole is called amphibole asbestos .

[Physical properties] white, gray or green; glass luster. The cleavage {210} is complete with an angle of 125°30'. The hardness is 5.6 to 6, and the relative density is 2.85 to 3.57.

[genesis and occurrence] is a rock-forming mineral of some chip rocks.

[identification characteristics] morphology, cleavage, color, produced in the chip rock.

[Main use] See the Asbestos family asbestos.

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