BUREAU OF ECONOMIC GEOLOGY
The University of Texas at Austin
Austin, Texas 78712
JOHN T. LONSDALE, Director
Report of Investigations—No. 42
Texas Gemstones
By
Elbert A. King, Jr.
February 1961
Second Printing—February 1963
Third Printing—September 1972
Fourth Printing—March 1983
Fifth Printing—August 1991
3
Contents
- Page
- Introduction 5
- Properties of gemstones 5
- Crystals 7
- Cutting and polishing of gemstones 10
- Cabochon gems 10
- Faceted gems 13
- Tumbled gems 17
- Texas gemstones 18
- Amber 18
- Augite 18
- Beryl 18
- Celestite 19
- Diamond 19
- Epidote 19
- Fluorite 20
- Fossil wood 20
- Gadolinite 21
- Garnet 22
- Jet 22
- Labradorite 23
- Microcline 23
- Obsidian 24
- Opal 24
- Pearl 24
- Quartz 25
- Crystalline varieties 25
- Amethyst 25
- Citrine 25
- Rock crystal 26
- Rose quartz 26
- Smoky quartz 26
- Cryptocrystalline varieties 27
- Chalcedony 27
- Agate 27
- Agatized wood 27
- Carnelian 27
- Jasper 27
- Sanidine 28
- Spinel 28
- Tektite (bediasite) 28
- Topaz 29
- Tourmaline 30
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