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Kabook is a clay ironstone found in Sri Lanka.
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Kainite is a compound salt consisting chiefly of potassium chloride and magnesium sulphate, occurring at the Stassfurt salt mines in Prussian Saxony.
Kainite dissolves easily in water and has a relative hardness of 3.
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Kalicine is native potassium bicarbonate occurring as a white crystalline mineral.
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Kalsilite is a rare hexagonal silicate of potassium and aluminium found in some lavas.
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Kamacite is an alloy of iron and nickel occurring in meteorites as bar-shaped masses.
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Kampylite or campylite is a variety of mimetite or arsenate of lead in hexagonal prisms of a fine orange yellow.
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Kaolin is a very pure white clay, ordinarily in the form of an impalpable powder, and used to form the paste of porcelain; China clay; porcelain clay. It is chiefly derived from the decomposition of common feldspar.
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Kaolinite is a hydrous silicate of aluminium with the formulae Al2Si2O5(OH)4 and a relative hardness of 3. It has a crumbly habit and forms the basis of most clay. Kaolinite is derived from the decomposition of feldspars, particularly aluminium silicates and is one of the most important of the natural industrial substances, used for bricks, ceramics, and many other applications.
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Kapia is the fossil resin of the kauri tree of New Zealand.
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Karpholite is a fibrous mineral occurring in tufts of a straw-yellow colour. It is a hydrous silicate of alumina and manganese.
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Keilhauite is a mineral of a brownish black colour, related to titanite in form. It consists chiefly of silica, titanium dioxide, lime, and yttria.
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Kernite is a major ore of boron. It is formed in playa lakes with the boron supplied by thermal springs passing through the underlying volcanic rock. It has the formulae Na2B4O7ù4H2O and a relative hardness of 3.
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Kidney ore is a variety of hematite or iron sesquioxide, occurring in compact kidney-shaped masses.
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Kiefekil is a species of clay.
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Kieserite, named after Professor Kieser, of Jena, is a hydrous sulphate of magnesia found at the salt mines of Stassfurt, Prussian Saxony.
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Kimberlite is an igneous rock containing very little silica.
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Knebelite, named after Major von Knebel, is a mineral of a grey, red, brown, or green colour, and glistening lustre. It is a silicate of iron and manganese.
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Kobellite, named after Franz von Kobell, of Munich, is a blackish grey mineral, a sulphide of antimony, bismuth, and lead.
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Kottigite is a dark red or brown coloured mineral formed as a weathering product of zinc minerals such as sphalerite. It is a minor ore of zinc and is named after Otto Kottig, a chemist who discovered it in Germany, kottigite being confirmed as a distinct species of mineral in 1850.
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Kunzite is a transparent form of spodumene. It was discovered in 1902 by George Kunz, the German mineralogist, near the Pala Chief Mountain in California.
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Kupletskite is a mineral confirmed as a distinct species in 1956 following work carried out by Boris Kupletski and his wife in Russia into the properties of astrophyllite. Astrophyllite undergoes a reaction in which the titanium is replaced by niobium, the resulting mineral being kupletskite which unlike astrophyllite has a triclinic system of symmetry.
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Kutnohorite is a rare greenish grey or pinkish coloured carbonate mineral confirmed as a distinct species of mineral in 1901 and named after the place where it was discovered - Kutna Hora in the Czech Republic. Kutnohorite is a carbonate of calcium. Iron and manganese related to ankerite and dolomite.
Kutnohorite has a relative hardness of 3.5 to 4.
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Kyanite is an accessory mineral in gneiss and mica schist. It often found with garnet and corundum. It is used in the production of refractory porcelains. It has the formulae Al2SiO5 and a relative hardness of 7.
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Abbreviations
Rocks & Minerals
