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Rate | Answer | Clue |
MAGNETITE | Black iron oxide | |
CHROMITE | A black submetallic mineral consisting of oxide of chromium and iron; -- called also chromic iron. | |
PSILOMELANE | A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color. | |
WADD | An earthy oxide of manganese, or mixture of different oxides and water, with some oxide of iron, and often silica, alumina, lime, or baryta; black ocher. There are several varieties. | |
CLINKER | A scale of oxide of iron, formed in forging. | |
BIND | Indurated clay, when much mixed with the oxide of iron. | |
COLORADOITE | Mercury telluride, an iron-black metallic mineral, found in Colorado. | |
HISINGERITE | A soft black, iron ore, nearly earthy, a hydrous silicate of iron. | |
MELACONITE | An earthy black oxide of copper, arising from the decomposition of other ores. | |
PITCHBLENDE | A pitch-black mineral consisting chiefly of the oxide of uranium; uraninite. See Uraninite. | |
ILVAITE | A silicate of iron and lime occurring in black prismatic crystals and columnar masses. | |
PACOS | An earthy-looking ore, consisting of brown oxide of iron with minute particles of native silver. | |
YENITE | A silicate of iron and lime occurring in black prismatic crystals; -- also called ilvaite. | |
FAYALITE | A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron. | |
MIARGYRITE | A mineral of an iron-black color, and very sectile, consisting principally of sulphur, antimony, and silver. | |
POLYBASITE | An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic. | |
TANTALITE | A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate of iron. | |
STERNBERGITE | A sulphide of silver and iron, occurring in soft flexible laminae varying in color from brown to black. | |
BRAUNITE | A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha. | |
STANNITE | A mineral of a steel-gray or iron-black color; tin pyrites. It is a sulphide of tin, copper, and iron. | |
HEMATINON | A red consisting of silica, borax, and soda, fused with oxide of copper and iron, and used in enamels, mosaics, etc. | |
COLCOTHAR | Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; -- called also crocus Martis. | |
ENARGITE | An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver. | |
GADOLINITE | A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron. | |
STEPHANITE | A sulphide of antimony and silver of an iron-black color and metallic luster; called also black silver, and brittle silver ore. |