Red purple gems and crystals11/20/2023 Quartz is colourless when pure but the presence of impurities gives a whole range of colours: purple - amethyst, smoky - cairngam, yellow - citrine, white - milky quartz, black - morion, pink - rose quartz, colourless - rock crystal. Quartz (the most common mineral in the earth's crust) It is the common mica widely used as electrical and heat insulating material. Muscovite is colourless or pale green, grey or brown, transparent of translucent with vitreous lustre. It usually occurs as lamellar masses or small flakes. Muscovite derives its name from the old name for Russia, muscovy. Amazon stone is a green variety of microcline, and moonstone has a bluish opal essence. Microcline received its name from the Greek words micro, "small", and kleinen, "incline", referring to the small inclination of the third crystallographic axis which makes microcline a triclinic mineral. The micas are monoclinic potassium alumino-silicates with sodium, lithium, magnesium or iron also present in certain varieties. These leaves are flexible and often hexagonal in outline. The Mica belongs to a group of minerals whose most obvious characteristic is the perfect cleavage, which means the minerals may be split into leaves thinner than sheets of paper. It is an important ore of iron, being found as a high-temperature accessory mineral in igneous and metamorphic rocks and in sulphide veins. It can be distinguished from hematite by its streak - magnetite being black and hematite red. It is a cubic mineral with the spinel type of structure. Magnetite is an iron oxide, which is so named for its strong magnetic property. Gold-bearing quartz id often of the milky variety. Gold occurs in many types of rocks but is common in small amounts in hydrothermal veins associated with quartz. Gold is cubic and has been found in well-formed octahedral and dodecahedral crystals, although it usually occurs as dendritic growth and occasionally as rounded masses (nuggets). Its malleability, relatively low melting point and chemical inertness have since time began made it ideal for works of art like the mask that covers the upper body of the mummified 14th Century Egyptian King Tutankhamen. Gold is steeped in history and has long been viewed as the most highly prized of metals. The colour is usually dark red inclining to violet-red. It is named after Alabanda, a town in Turkey, where mining, cutting and polishing of the stones was practiced in ancient times. There are 6 members of the garnet group of which Almandine, an iron silicate, is most common to the Territory. Garnet is really the name for a group of minerals, with a common crystal habit and chemical composition. Industrially, garnet is used as an abrasive. Garnet is a typical mineral of metamorphic rock, usually forming isolated crystals disseminated through the rock.
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