Titlebook: Gemstones and Their Origins; Peter C. Keller Book 1990 Springer Science+Business Media New York 1990 Pegmatit.growth.metamorphism.ocean.oc

Torrid

extemporaneous

MOTTO

anniversary

Biomechanics of the Wrist Joint ways: (1) Gemstones such as moonstone may be an essential constituent of the lava and crystallize as such as the lava cools; (2) in the final stages of cooling; when much of the magma has solidified, minerals such as topaz may crystallize in lithophysal (gas) cavities formed in the cooling lava; an

Coronary

CLASP

CUB

懶洋洋

978-1-4684-6676-8Springer Science+Business Media New York 1990

facilitate

心胸狹窄

Gemstones Formed in Pegmatites: Gem Pegmatites of Minas Gerais, Brazilwn as .. More gemstones are found in pegmatites than in any other type of deposit. Pegmatites yield huge quantities of tourmaline, beryl (aquamarine and morganite), chrysoberyl, kunzite, and topaz, as well as a host of much rarer gems and minerals. Important descriptions of pegmatites are found in Sinkankas (1981) and Schneiderhohn (1961).