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Appendix B-E: Gem Properties

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APPENDIX D.
RELATIVE HARDNESS OF PRECIOUS STONES. — SCALE, FROM I TO IO.
First rank, io . . . Diamond.
Second rank, 9 . . . Varieties of the precious corundum (Ruby 8.8).
Third rank, 8+ . . . Chrysoberyl, spinel, topaz.
Fourth rank, 7+ . . Andalusite, beryl, euclase, hiddenite, iolite, phenakite,
quartz, tourmaline, zircon.
Fifth rank, 6+ . . . Amazon-stone (or microcline), adularia, axinite, chondrodite,
chrysolite, diaspore, epidote, garnet, jade, jadeite, labradorite, marcasite, moonstone, obsidian, pyrite, rutile, spodumene, sunstone, turquoise, vesuvianite (or idocrase),
zonochlorite.
Sixth rank, 5+ . . . Bowenite, chlorastrolite, diopside, dioptase, hematite, hypersthene, kyanite, lapis-lazuli, magnetite (or lodestone),
monazite, octahedrite, opal, thomsonite, titanite, willemite.
Seventh rank, 4+ . . Crocidolite, williamsite, apophyllite.
Eighth rank, 3+ . . Azurite, euchroite, malachite, rhodocrosite, vulpinite.
Ninth rank, 2+ . . . Agalmatolite, amber, barite, calcite, crocoite, lepidolite,
serpentine.
Tenth rank, i+. . . Jet, selenite, steatite.
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Appendix B-E: Gem Properties Page of 401 Appendix B-E: Gem Properties
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