All Words Glossary

Glossary of Minerals Terms
beginning with letter A
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adularia Tweet Definition of adularia Like Definition of adularia on Facebook
noun (plural:adularias)
  1. A variety of orthoclase feldspar found as colorless to white prismatic crystals in cavities in metamorphic rocks. Some specimens reflect a bluish sheen along crystal faces. This phenomenon is called adularescence, and adularia with this property is called moonstone. (See sanidine).
  • Chemical composition: Potassium aluminum silicate, <math>KAlSi?_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
    Specific gravity: 2.6
    Color: white, colorless
    Luster: glassy
    Fracture: conchoidal
    Habit: prismatic.
albite Tweet Definition of albite Like Definition of albite on Facebook
noun (plural:albites)
  1. (mineralogy) A plagioclase feldspar, the first member of the Albite-Anorthite solid solution series. Primarily a mineral of plutonic rocks, also found in pegmatites. When Albite substitutes for a potassium feldspar in granite, the rock is called quartz monzonite.
  • Chemical composition: Sodium aluminum silicate, <math>NaAlSi?_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
    Specific gravity: 2.63
    Color: white, sometimes with a bluish cast
    Luster: glassy
    Fracture: conchoidal
    Cleavage: two good at about 94º to each other
  • Habit: Triclinic - pinacoidal. Usually twinned and striated. The striations are visible to the naked eye, and are characteristic of plagioclase feldspars in general and Albite in particular.
allomorph Tweet Definition of allomorph Like Definition of allomorph on Facebook
noun
  1. (chemistry) any of the different crystalline forms of a substance
  2. (linguistics) any of the different phonological representations of a morpheme
amalgam Tweet Definition of amalgam Like Definition of amalgam on Facebook
noun (pl=amalgams)
  1. A combination of different things
  2. An alloy containing mercury
amianthus Tweet Definition of amianthus Like Definition of amianthus on Facebook
noun
  1. a type of asbestos with long, soft, thin fibers
amphibole Tweet Definition of amphibole Like Definition of amphibole on Facebook
noun
  1. A large group of structurally similar hydrated double silicate minerals, containing various combinations of sodium, calcium, magnesium, iron, and aluminium/aluminum
anatase Tweet Definition of anatase Like Definition of anatase on Facebook
noun
  1. a blue or brown mineral, a form of titanium dioxide, used as a pigment
andesine Tweet Definition of andesine Like Definition of andesine on Facebook
noun
  1. (mineralogy) sodium calcium aluminum silicate, (<math>Na_xCa_xAlSi_3O_8</math>), a plagioclase feldspar, the third member of the albite-anorthite solid solution series. Found in fine-grained andesite lavas; crystals are rarely seen.
anhydrite Tweet Definition of anhydrite Like Definition of anhydrite on Facebook
noun
  1. (mineralogy) a saline evaporite consisting of anhydrous calcium sulphate
anisometric Tweet Definition of anisometric Like Definition of anisometric on Facebook
adjective
  1. Not isometric or symmetrical.
anorthite Tweet Definition of anorthite Like Definition of anorthite on Facebook
noun (plural:anorthites)
  1. (mineralogy) A plagioclase feldspar, the final member of the Albite-Anorthite solid solution series. Anorthite is very rare on Earth, but abundant in moon rocks. This is because Anorthite weathers rapidly to clay minerals under atmospheric conditions. Good crystals have been found in lava-digested limestone blocks erupted from Mount Vesuvius.
  • Chemical composition: Calcium aluminum silicate, <math>CaAlSi?_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
    Specific gravity: 2.76
    Color: Shades of gray, often with a blue, purple, or green cast
    Luster: glassy
    Fracture: conchoidal
    Cleavage: two good at about 94º to each other
  • Habit: Triclinic - pinacoidal. Crystals are well developed, forming massive clumps, and are both twinned and striated.
apatite Tweet Definition of apatite Like Definition of apatite on Facebook
noun
  1. (mineralogy) a calcium fluoride phosphate of variable composition used in the manufacture of fertilizer
aragonite Tweet Definition of aragonite Like Definition of aragonite on Facebook
noun
  1. (mineralogy) a saline evaporite consisting of anhydrous calcium carbonate; it is dimorphous with calcite
argentite Tweet Definition of argentite Like Definition of argentite on Facebook
noun (uncountable)
  1. (mineralogy) silver sulphide, (<math>Ag_2S</math>), a primary ore of silver, in cubic or hexoctahedral crystals.
arsenic Tweet Definition of arsenic Like Definition of arsenic on Facebook
noun
  1. A nonmetallic chemical element (symbol As) with an atomic number of 33.
  2. arsenic trioxide, Arsenic trioxide.
adjective
  1. Of, or containing arsenic with a valence of 5.
asbestos Tweet Definition of asbestos Like Definition of asbestos on Facebook
noun
  1. Either of several fibrous mineral forms of magnesium silicate, used for fireproofing, electrical insulation, building materials, brake linings, and chemical filters; The small fibres can cause cancer when lodged in the lungs
adjective
  1. Of, or relating to asbestos.
augite Tweet Definition of augite Like Definition of augite on Facebook
noun
  1. A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt.
auriferous Tweet Definition of auriferous Like Definition of auriferous on Facebook
adjective
  1. containing or producing gold; gold-bearing
aventurine Tweet Definition of aventurine Like Definition of aventurine on Facebook
noun
  1. A kind of glass, containing gold-colored spangles. It was produced in the first place by the accidental (par aventure) dropping of some brass filings into a pot of melted glass.
  2. (mineralogy) A variety of translucent quartz, spangled throughout with scales of yellow mica.
axinite Tweet Definition of axinite Like Definition of axinite on Facebook
noun
  1. A borosilicate of aluminum, iron, and lime, commonly found in glassy, brown crystals with acute edges.
azurite Tweet Definition of azurite Like Definition of azurite on Facebook
noun
  1. (mineralogy) A blue vitreous mineral; a basic copper carbonate

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