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See Rake, a mineral vein.

Arsenic sulphide, a mineral of a brilliant red color; red orpiment. It is also an artificial product.

Having the form or shape of a kidney; as, a reniform mineral; a reniform leaf.

An inflammable mineral resin, usually of a yellowish brown color, found in roundish masses, sometimes with coal.

A variety of the mineral cyanite.

Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called also dialogite.

Manganese spar, or silicate of manganese, a mineral occuring crystallised and in rose-red masses. It is often used as an ornamental stone.

A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore.

powdery variety of calcite occuring as an efflorescence. -- Rock milk. (Min.) See Agaric mineral, under Agaric. -- Rock moss, a kind of lichen; the cudbear. See Cudbear. -- Rock oil. See Petroleum. -- Rock parrakeet (Zoöl.), a small Australian parrakeet (Euphema petrophila), which nests in holes among the rocks of…

A mineral of a hyacinth or honey-yellow color, occuring in square octahedrons. It is an antimonate of calcium.

A green micaceous mineral occurring in minute scales. It is essentially a silicate of aluminia and potash containing vanadium.

hide of arsenic; -- called also ruby sulphur. -- Ruby of zinc (Min.), zinc sulphide; the mineral zinc blende or sphalerite. -- Ruby silver (Min.), red silver. See under Red.

Having the appearance of ruins, or of the ruins of houses; -- said of certain minerals.

A mineral usually of a reddish brown color, and brilliant metallic adamantine luster, occurring in tetragonal crystals. In composition it is titanium dioxide, like octahedrite and brooklite.

Resembling sagenite; -- applied to quartz when containing acicular crystals of other minerals, most commonly rutile, also tourmaline, actinolite, and the like.

. (Zoöl.) See under Giant. -- Salamander's hair or wool (Min.), a species of asbestus or mineral flax. [Obs.] Bacon.

Any mineral salt used as an aperient or cathartic, especially Epsom salts, Rochelle salt, or Glauber's salt.

A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.

a articulata), and pulverized for pounce; -- probably so called from a resemblance to the mineral.

A tough, compact mineral, of a white, greenish, or grayish color. It is near zoisite in composition, and in part, at least, has been produced by the alteration of feldspar.