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Sec. IV, Ch. 21: Semi-Precious Stones, Lapis-lazuli
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CHAPTER XXI.
LAPIS-LAZULI.
HIS stone is remarkable for its beautiful blue colour, whence the Arabians call it
Azul,
meaning "blue." Theophrastus describes a blue stone "spotted with gold dust," while Pliny speaks of it as being "like to the serene blue heavens, fretted with golden fire." The " gold " mentioned by these and other ancient authors refers to the spangles of brassÂlike iron-pyrites which are commonly dispersed through the rich blue substance of the Lapis-Lazuli.
The colour of the stone varies from pale azure to deep blue, with a tint of green ; but is seldom quite pure, being often mottled with white and yellow spots. Indeed, the Lapis-Lazuli is not a homogeneous substance, but consists of a definite blue mineral, which is probably referable to the species
Haiiyne,
associated with a colourless substance, whence its mottled appearance. It is brittle, has but little lustre, and is translucent only at the corners of thin edges. The precise origin of the beautiful blue colour of the Lapis-Lazuli is still a matter on which chemical opinion is divided. It is usually referred to the presence of a sulÂphide, probably of sodium and iron, but it appears likely that the sulphur is present in the form both of a sulphide
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Table Of Contents
Annotate/ Highlight
Streeter: Precious Stones and Gems
Introduction & Preface
Sec. I, Ch. 1
: Precious Stone or Gem Defined
Sec. I, Ch. 2
: Where Precious Stones are Found
Sec. I, Ch. 3
: Uses in Bygone Times
Sec. I, Ch. 4
: Working of Precious Stones
Sec. I, Ch. 5
: Engraving & Carving
Sec. I, Ch. 6
: Precious Stones as Objects of Commerce
Sec. I, Ch. 7
: Burning & Colouring of Precious Stones
Sec. II, Ch. 1
: Diamonds
Sec. II, Ch. 2
: African Diamonds
Sec. II, Ch. 3
: Australian Diamonds
Sec. II, Ch. 4
: Borneo Diamonds
Sec. II, Ch. 5
: Brazilian Diamonds
Sec. II, Ch. 6
: British Guiana Diamond
Sec. II, Ch. 7
: Indian Diamonds
Sec. II, Ch.
: Russian Diamonds
Sec. II, Ch. 9
: United States Diamonds
Sec. II, Ch. 10
: Coloured Diamonds
Sec. II, Ch. 11
: Bort Diamonds
Sec. II, Ch. 12
: Carbonado Diamonds
Sec. II, Ch. 13
: Value of Rough Diamonds
Sec. III, Ch. 1
: Ruby
Sec. III, Ch.
2: Ruby Mines of Burma
Sec. III, Ch. 3
: Ruby Mines of Burma Connection
Sec. III, Ch. 4
: The Sapphire
Sec. III, Ch.
: Star Stones
Sec. III, Ch. 6
: Spinel & Balas
Sec. III, Ch. 7
: Emeralds
Sec. III, Ch. 8
: Cat's Eye, The Chrysoberyl
Sec. III, Ch. 9
: Alexandrite
Sec. III, Ch. 10
: Opals
Sec. III, Ch. 11
: Turquoise
Sec. IV, Ch. 1
: Agate
Sec. IV, Ch. 2
: Amazonite
Sec. IV, Ch. 3
: Amber
Sec. IV, Ch. 4
: Amethysts
Sec. IV, Ch. 5
: Andalusite
Sec. IV, Ch. 6
: Aquamarines or Beryl
Sec. IV, Ch. 7
: Aventurine
Sec. IV, Ch. 8
: Bloodstones
Sec. IV, Ch. 9
: Carnelian
Sec. IV, Ch. 10
: Chrysoberyl
Sec. IV, Ch. 11
: Chrysoprase
Sec. IV, Ch. 12
: Crocidolite
Sec. IV, Ch. 13
: Euclase
Sec. IV, Ch. 14
: Garnet, Carbuncle, & Cinnamon Stone
Sec. IV, Ch. 15
: Hematite
Sec. IV, Ch. 16
: Hiddenite
Sec. IV, Ch. 17
: Iolite
Sec. IV, Ch. 18
: Jade
Sec. IV, Ch. 19
: Jasper
Sec. IV, Ch. 20
: Labradorite
Sec. IV, Ch. 21
: Lapis-lazuli
Sec. IV, Ch. 22
: Malachite
Sec. IV, Ch. 23
: Moonstone, Selenite, & Sunstone
Sec. IV, Ch. 24
: Moroxite
Sec. IV, Ch. 25
: Obsidian
Sec. IV, Ch. 26
: Oriental Onyx
Sec. IV, Ch. 27
: Peridot or Chrysolite
Sec. IV, Ch. 28
: Phenakite
Sec. IV, Ch. 29
: Quartz Cat's Eye
Sec. IV, Ch. 30
: Rhodonite
Sec. IV, Ch. 31
: Rock Crystal
Sec. IV, Ch. 32
: Sphene
Sec. IV, Ch. 33
: Spodumene
Sec. IV, Ch. 34
: Topaz
Sec. IV, Ch. 35
: Tourmaline
Sec. IV, Ch. 36
: Zircon or Jargoon
Appendix A
: Discrimination of Precious Stones
Appendix B
Index
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