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13. If a common object like steel file, glass, knife blade, wire nail, penny and fingernail have their specific scale of hardness which of the following rock forming minerals has the ability to scratch all these things?
a. Apatite
b. Orthoclase
c. Diamond
d. Talc

Sagot :

BLOXPRUTEROIN BLOXPRUTEROIN

Answer:

D.Talc

Explanation:

Talc, or talcum, is a clay mineral, composed of hydrated magnesium silicate with the chemical formula Mg3Si4O10(OH)2. Talc in powdered form, often combined with corn starch, is used as baby powder. This mineral is used as a thickening agent and lubricant; is an ingredient in ceramics, paint, and roofing material; and is a main ingredient in many cosmetics.[5] It occurs as foliated to fibrous masses, and in an exceptionally rare crystal form. It has a perfect basal cleavage and an uneven flat fracture, and it is foliated with a two-dimensional platy form

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