Spar (Mineralogy)
978-613-6-30433-5
6136304333
92
2011-06-28
34.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Spar is a term that is used to refer to a category of crystals that have readily discernible faces. Crystallized, earthy, and some metallic, a spar will easily break into rhomboidal, cubical, or laminated fragments with polished surfaces, but without regard to the ingredients of which they are composed. The various "spar" minerals were a historical term among miners and alchemists for any nonmetallic mineral akin to gypsum, known in Old English as spærstān, spear stone, referring to its crystalline projections. Thus, the word spar in mineralogy has the same root as "spear," by way of comparison to gypsum, as a common natural crystal forming in spearlike projections.
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Минералогия, петрография
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