Composition
Serpentine minerals (magnesium silicates; (Mg, Fe)3Si2O5(OH)4). Olive-green, blackish to yellowish green, greasy, waxy, or silky minerals with a hardness of 3-5.
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Description
A nondescript rock with a dark green to yellow-green color, often streaked or shot through with veins of other colors. Rock tends to be soft (H 3-5), and have a greasy or silky feel, especially on smooth flat surfaces; cut surfaces have a highly polished- waxed slickness to them. Luster tends to be dull or waxy.
Once one becomes familiar with the rock it is distinctive and easy to recognize, but it is the "feel" of it that is most indicative.
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