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Gemstones Formed Directly from Molten Rock: The Ruby Deposits of Chanthaburi-Trat, Thailand

  • Peter C. Keller

Abstract

Molten lava erupting from fissures or volcanoes on the earth’s surface may be a source for gemstones. These hot lavas may contain gems in one of three 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; and (3) the lava may simply act as the vehicle that transports materials that crystallized at great depth to the surface. Such is the case with many alkaliolivine basalts, which may bring peridot, zircon, sapphire, or ruby up from 100-km depths (Fig. 5-1).

Keywords

Alkali Basalt Water Cannon Cooling Lava Geologic Reconnaissance Eluvial Deposit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Van Nostrand Reinhold 1990

Authors and Affiliations

  • Peter C. Keller
    • 1
  1. 1.Natural History Museum of Los Angeles CountyUSA

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