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agate aggregate amethysts andalusite Aquamarines associated beryl group Bixbite blue Brazil brown Burma calcite Canada chemical CIS the Urals Citrine cleavage colorless commonly occurs copper Crystal Structure Crystal Structure Hexagonal Crystal Structure Isometric Crystal Structure Monoclinic Crystal Structure Orthorhombic crystals are found crystals are usually cut into gemstones deposits occur diamond dissolve dull emerald former Czechoslovakia found in Brazil fuse easily gemstones gray green group Mohs heated hence the name hydrochloric acid hydrothermal hydrothermal veins igneous India industry infusible insoluble in acid iron lapis lazuli Madagascar magmatic Malachite masses metallic metamorphic rocks Mexico mineral Monoclinic moonstone Namibia Nickeline occur in Australia Opals Orthoclase Orthorhombic pegmatites Phenacite pink Quality crystals quartz Rhodonite rubies sapphire sedimentary silver Smithsonite soluble South Africa Specific Gravity Sphalerite Sri Lanka stone sulfur synthetic temperature topaz tourmaline translucent transparent turquoise United States California usually occurs variety violet vitreous luster yellow