The book Span Classsearchtermclassspan book of Geology was written by author Archibald Geikie Here you can read free online of Span Classsearchtermclassspan book of Geology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Span Classsearchtermclassspan book of Geology a good or bad book?
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61, 65). Sulphates. Two sul- phates deserve notice for their importance among rock- FIG. 61. Sphserosiderite or Clay- masses those Of lime and ir nstone concretion enclosing portion of a fern, baryta. GYPSUM (hydrous calcium - sulphate, CaSO 4 +2HO 2 ) occurs in monoclinic crystals, commonly with the form of right rhomboidal prisms (Fig. 62, a), which not infrequently appear as macks or twin -crystals (Fig. 62, b\ When pure it is clear and colourless, with a peculiar pearly lustre (Selemte); it... is found fibrous with a silky sheen (Satin- spar}, also white and granular (Alabaster). It is so soft as to be easily cut with' a knife or even scratched with the finger-nails. It is readily distinguished from calcite by its crystalline form, softness, and non-effervescence with acid. When burnt it becomes an opaque white powder (plaster of 182 ELEMENTS OF EARTH S CRUST. [CHAP. Paris). Gypsum occurs in beds associated with sheets of rock-salt and dolomite (pp. 63, 206) ; it is soluble in water, and is found in many springs and rivers, as well as in the sea.
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