Madison
发表于 2025-3-21 19:30:57
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Asseverate
发表于 2025-3-21 23:46:23
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图画文字
发表于 2025-3-22 04:23:24
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 S
Encumber
发表于 2025-3-22 04:59:34
Gemstones Formed Directly from Molten Rock: The Ruby Deposits of Chanthaburi-Trat, Thailand 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
CLOUT
发表于 2025-3-22 08:54:47
Gemstones Formed by Low-Pressure Regional Metamorphism: The Ruby Deposits of Mogok, Burmaintrudes into the cool surrounding rock, the rock is heated and saturated by hydrothermal fluids and commonly undergoes change in the form of replacement of some of its component minerals or recrystallization of the entire rock mass. The type and degree of change are dependent upon the temperature a
excrete
发表于 2025-3-22 16:10:59
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excrete
发表于 2025-3-22 19:09:27
Diamond Pipes: The Diamond Deposits of Argyle, Western Australiacrust to bring mantle material such as diamond to the surface (Fig. 9–1). Experimental work has shown that most synthetic diamonds generally must have very high temperatures (2,000°C) and pressures (70,000 kg/cm.) to form. In nature these conditions exist only at depths of at least 200 km below the
陈腐思想
发表于 2025-3-22 23:30:03
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试验
发表于 2025-3-23 05:11:40
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Gene408
发表于 2025-3-23 08:40:06
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