What do you need to know (meaning understand, not just memorize) to do spectacularly well on Quiz 3? The essential terms and concepts are listed below. Writing out answers to each of the following would be an excellent way to prepare.
amorphous, crystalline, metamict, glass, tektite, aggregate, crystal system, crystal lattice, axis, unit cell, habit, acicular, prismatic, dendritic, drusy, botryoidal, massive, polymorph, twin, negative crystal, phantom, pseudomorph, silicate, oxide, phosphate, carbonate, native element, cleavage, fracture, conchoidal, hardness, Mohs' Scale, toughness, stability, crazing, stress fracture, quench crackle, specific gravity, hydrostatic weighing, heavy liquids, hot point test, thermal conductivity
From what do the physical properites of gems derive?, amorphous gems vs single gems crystal and examples, aggregates: micro and cryptocrystalline and examples, mineral vs rock, recognize the names of the seven crystal systems, in general, how do they differ from each other?, relationship between unit cell, crystal system and crystal habit, be able to recognize the following habits: cube, octahedron, acicular, prismatic, dendritic, drusy, botryoidal, massive, summarize the factors which control crystal growth, distinguish between polymorphs, twins, phantoms, negative crystals and pseudomorphs, recognize appearance of and examples of each, be able to assign a gem to one of five chemical groups based on looking at its chemical formula (silicate, oxide, phosphate, carbonate, native element), cleavage vs fracture, types of each, what are the three factors of gem durability, how is each described with relevant examples, how is knowledge of these factors of durability useful (examples), what is specific gravity, why do gems differ in this regard, how is it measured? pros and cons of each SG method, for which gems would testing thermal reaction, thermal conductivity and electrical conductivity be useful, why?
Moldavite, chalcedony, drusy, uvarovite, cryptocrystalline, acicular, rutile, mesolite, botryoidal, maacle, lepidocrosite, Goethite, chrysoberyl, apatite, conchoidal, Charoite, Mohs, kyanite, sphalerite, chrysoprase, nephrite, meerschaum, Andalusite, scheelite, angelsite, cassiterite, chrome diopside, Moissanite