Explanation
Simple layered structure of hydroxide minerals. The chemical formula is Mg (OH) 2. Fe, Mn, and Zn can replace Mg with isomorphism. Trilateral system, space group DirP3m. crystal are tabular or leaf shaped, often tabular, scaly or round, and aggregates are irregular granular or fibrous. White, grayish white. Sometimes appearing in green, yellow, or brownish red. Stripe white. The fresh crystal plane and fracture surface are glass luster, the cleavage surface is pearly luster, and the fibrous surface is silk luster. Transparent. Mohs hardness 2.5, density 2.3-2.6g/cm3. Fine pieces have flexibility and flexibility. It has thermoelectric properties. The fiber is coarse and brittle, without elasticity and flexibility, easy to break and good splitting performance. The product of secondary transformation after the action of alkaline solution on magnesium silicate. It is commonly found in the fissures of serpentinite or serpentinized pure peridmite. It also occurs in contact metamorphic magnesite limestone and coexists with caldte, tremolite, serpentine, phlogopite, etc. It is used as raw mineral material for extracting magnesium in large amount.
Classification
Natural materials and products -> Mineral materials