POPULAR SEARCHES:   rings  necklaces  earrings  beryl  cut stones  brooch  
 
This chapter is tagged (labeled) with: 

Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc.

Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Page of 364 Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Text size:minus plus Restore normal size   Mail page  Print this page
GEMS AND PRECIOUS STONES                                107
Cat's-eye.—Translucent, gray or greenish, chatoyant when cut en cabochon, an effect due to fibres of asbestus or actin-olite.
Hyaline.—Opalescent white, due to admixture of chalce­dony.
Milk Quartz.—Opalescent, milky white, sometimes yellow by transmitted light.
Morion.—Deep black, almost opaque.
Prase.—Translucent, leek-green, deep green.
Rock Crystal.—Transparent and colorless.
Rose Quartz.—Rose red or pink, sometimes opalescent.
Sapphirine Quartz or Siderite.—Translucent and grayish blue, indigo, and Berlin blue color.
Sagenite.—Penetrated with acicular crystals of other mine-rals, generally rutile, tourmaline, gothite, stibnite, asbestus, acti-nolite, hornblende, epidote, etc.
Smoky Quartz.—Transparent, and various shades of gray and brown.
False Topaz, Scotch, Saxon, or Spanish Topaz.—Trans­parent yellow or light brown, generally the result of decoloriza-tion by heat.
The cryptocrystalline varieties are :
Agate Chalcedony.—Jasper or rock crystal, mottled or in layers; when irregular, called fortification agate; when banded, banded agate.
Agate Jasper.—A variety of agate containing jasper.
Basanite, Lydian Stone, or Touchstone.—A velvet-black siliceous stone, or flinty jasper, used by the jewelers for trying the purity of precious metals.
Beekite.—Silicified corals, shells, or limestones, resembling chalcedony.
Bloodstone.—Jasper, translucent to opaque, green with red spots.
Chalcedony.—Clouded or translucent, white, yellow, brown, or blue.
Chrysoprase.—Translucent, pale bluish-green or yellow-green.
Carnelian.—Translucent like horn, yellow, brown, or red.
Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Page of 364 Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc.
Suggested Illustrations
Other Chapters you may find useful
Other Books on this topic
bullet Tag
This Page