epidote

ep·i·dote

E0177400 (ĕp′ĭ-dōt′)n. A lustrous yellow, green, or black mineral, Ca₂(Al, Fe)₃(SiO₄)₃OH, commonly found in metamorphic rock.

[French épidote, from Greek epididonai, to give in addition, increase (from the greater length of its crystals compared with those of related minerals) : epi-, epi- + didonai, to give; see dō- in Indo-European roots.]

ep′i·dot′ic (-dŏt′ĭk) adj.

epidote

(ˈɛpɪˌdəʊt) n (Minerals) a green mineral consisting of hydrated calcium iron aluminium silicate in monoclinic crystalline form: common in metamorphic rocks. Formula: Ca2(Al,Fe)3(SiO4)3(OH)[C19: from French épidote, ultimately from Greek epididonai to increase, from didonai to give; so called because two sides of its crystal are longer than the other two sides] epidotic adj

ep•i•dote

(ˈɛp ɪˌdoʊt)

n. a mineral, hydrous calcium aluminum iron silicate, Ca₂(Al, Fe)₃Si₃O₁₂(OH), occurring in green prismatic crystals or in masses. [1800–10; < French épidote < Greek *epidotós given besides, increased] ep`i•dot′ic (-ˈdɒt ɪk) adj.

Translations

épidote

Epidote

epidote

[′ep·ə‚dōt] (mineralogy) A pistachio-green to blackish-green calcium aluminum sorosilicate mineral that crystallizes in the monoclinic system; the luster is vitreous, hardness is 6½ on Mohs scale, and specific gravity is 3.35-3.45.

Epidote

a rock-forming mineral of the silicate class, with chemical composition Ca₂[Al, Fe, Mn]₃[SiO₄][Si₂O₇]O(OH). Epidote crystallizes in the monoclinic system, often forming well-faceted, elongated prismatic crystals. It also occurs in the form of granular, divergent, or parallel columnar aggregates. It has a perfect cleavage and a vitreous luster. Its hardness on Mohs’ scale is 6–7. Its density increases from 3,300 to 3,450 kg/m³ with increasing iron and manganese content. The color of epidote is related to inclusions of ions of transition metals in the structure and varies from colorless or bluish gray (for clinozoisites, which do not contain Fe and Mn) to dark green (for large concentrations of Fe). Epidote with a high Mn content, called piedmontite, has a pink or red-brown color.

Epidote is a typical mineral of limestone skarns, as well as of low- and medium-temperature metamorphic rocks rich in Ca. Experimental study of certain important chemical reactions between epidote and other silicates (garnet and anorthite) has made it possible to use epidote as an indicator of the physicochemical conditions of the formation of the rocks in which it is found.

REFERENCE

Kepezhinskas, K. B., and V. V. Khlestov. Statisticheskii analiz mine-ralov gruppy epidota i ikhparageneticheskie tipy: Moscow, 1971.

L. IA. ARANOVICH

单词	epidote
释义	epidote ep·i·dote E0177400 (ĕp′ĭ-dōt′)n. A lustrous yellow, green, or black mineral, Ca₂(Al, Fe)₃(SiO₄)₃OH, commonly found in metamorphic rock. [French épidote, from Greek epididonai, to give in addition, increase (from the greater length of its crystals compared with those of related minerals) : epi-, epi- + didonai, to give; see dō- in Indo-European roots.] ep′i·dot′ic (-dŏt′ĭk) adj. epidote (ˈɛpɪˌdəʊt) n (Minerals) a green mineral consisting of hydrated calcium iron aluminium silicate in monoclinic crystalline form: common in metamorphic rocks. Formula: Ca2(Al,Fe)3(SiO4)3(OH)[C19: from French épidote, ultimately from Greek epididonai to increase, from didonai to give; so called because two sides of its crystal are longer than the other two sides] epidotic adj ep•i•dote (ˈɛp ɪˌdoʊt) n. a mineral, hydrous calcium aluminum iron silicate, Ca₂(Al, Fe)₃Si₃O₁₂(OH), occurring in green prismatic crystals or in masses. [1800–10; < French épidote < Greek epidotós given besides, increased] ep`i•dot′ic* (-ˈdɒt ɪk) adj. Translations épidote Epidote epidote [′ep·ə‚dōt] (mineralogy) A pistachio-green to blackish-green calcium aluminum sorosilicate mineral that crystallizes in the monoclinic system; the luster is vitreous, hardness is 6½ on Mohs scale, and specific gravity is 3.35-3.45. Epidote a rock-forming mineral of the silicate class, with chemical composition Ca₂[Al, Fe, Mn]₃[SiO₄][Si₂O₇]O(OH). Epidote crystallizes in the monoclinic system, often forming well-faceted, elongated prismatic crystals. It also occurs in the form of granular, divergent, or parallel columnar aggregates. It has a perfect cleavage and a vitreous luster. Its hardness on Mohs’ scale is 6–7. Its density increases from 3,300 to 3,450 kg/m³ with increasing iron and manganese content. The color of epidote is related to inclusions of ions of transition metals in the structure and varies from colorless or bluish gray (for clinozoisites, which do not contain Fe and Mn) to dark green (for large concentrations of Fe). Epidote with a high Mn content, called piedmontite, has a pink or red-brown color. Epidote is a typical mineral of limestone skarns, as well as of low- and medium-temperature metamorphic rocks rich in Ca. Experimental study of certain important chemical reactions between epidote and other silicates (garnet and anorthite) has made it possible to use epidote as an indicator of the physicochemical conditions of the formation of the rocks in which it is found. REFERENCE Kepezhinskas, K. B., and V. V. Khlestov. Statisticheskii analiz mine-ralov gruppy epidota i ikhparageneticheskie tipy: Moscow, 1971. L. IA. ARANOVICH
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