(2) Gypsum ; the composition is the sulphate phase sulphate, which does not react with dilute hydrochloric acid. The hardness is 2 degrees, the knife can be scored, and the hard one is fibrous or dense. Soft sex is powdery. Its solution was titrated to a milky white with chlorination.
(3) Glauber's salt ; the sulfate component sodium sulfate crystallizes well. It can be seen as a diamond-shaped crystal. It can be evaporated and crystallized. The evaporating crystals appear as "hairy" on the surface of the cuttings, with astringent taste and cool feeling.
(4) Basalt; is a rock of volcanic eruption, gray and black and dark green common component mainly plagioclase, dense and hard, does not react with acids, mostly granular or massive debris.
(5) Granite ; it is a kind of fire intrusion rock, very hard, mainly composed of feldspar, quartz , mica, etc. It is more common in meat red and black (more in variegated color) and does not react with hydrochloric acid.
(6) Tuff ; is a volcanic eruptive rock with a rough surface, composed of black and white minerals, pyroxene, hornblende, feldspar and volcanic ash, etc., condensed structure, hard, non-reactive with acid, soil-like fracture Rough.
(7) kaolin; mostly white, dense and creamy feel soft, aluminum silicate rocks earth, feldspar weathering often, sometimes associated with bauxite, with plastic, resistant to temperatures 350 ° c , and acid is not opposite.
(8) White and evil; white, loose, soft and brittle, powdered,
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