Earth Sciences 2281A/B Study Guide - Midterm Guide: Silicate Minerals, Travertine, Crystal System
3 Apr 2017
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Chemical classes: silicate pure silicon dioxide, sio2 (quartz), or sio4. Physical properties: colour, clarity transparent, translucent, opaque, crystal forms geometric shape, crystal faces (angle of intersection fig. 3. 4, development of crystal faces, crystal system fig. 3. 5: habit characteristic crystal form or combinations it habitually makes, luster metallic/non-metallic (vitreous, waxy, pearly, earthy, greasy, streak colour of powder after being scratched, hardness resistance to scratching softest 1, hardest 10 (fig. 3. 9: cleavage tendency to break along flat/parallel surfaces (excellent, good, poor) (fig. Cleavage direction orientation relative to crystalline structure: fracture any break that does not occur along a cleavage plane (uneven, splintery, conchoidal) Earth science 2281b mid-lab exam review: tenacity brittle, malleable, elastic, sectile, reaction to acid all carbonate minerals will fizz , striation straight, hairline grooves, magnetism, specific gravity. 3. 18-3. 21: determine luster (metallic/non-metallic, determine hardness of mineral, determine cleavage and fracture, color and streak, other properties. Chemical sediment water full of chemicals evaporates and leaves crystals, in situ.
