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Ch. 7: Opal

Ch. 7: Opal Page of 311 Ch. 7: Opal Text size:minus plus Restore normal size   Mail page  Print this page
158                               PRECIOUS STONES.
Actinolite or other members of the Amphibole group occur in the kind known as Thetis' Hair Stone. The high adamantine lustre and rich reddish-brown colour of the Eutile crystals give a striking effect when contained in a polished piece of clear Quartz (Fig. 13).
Madagascar yields specimens containing Manganite and Hornblende. Quartz with needles of Gôthite is found
near St. Petersburg ; that with Rutile occurs in Savoy and Switzerland.
10. Coming under this head, but worthy of separate mention is the variety known as Cat's Eye, further dis­tinguished from Cymophane, a variety of Chrysoberyl, as Quartz Cat's Eye, or Occidental Cat's Eye. It is crystalline Quartz, containing delicate closely-packed and parallel fibres of Asbestos, which give it a greenish or grey tint. On
Ch. 7: Opal Page of 311 Ch. 7: Opal
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