Information AboutHornblende |
| CATEGORIES ABOUT HORNBLENDE | |
| inosilicates | |
| calcium minerals | |
| iron minerals | |
| magnesium minerals | |
| aluminium minerals | |
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Hornblende is a complex Inosilicate series of Mineral s. Hornblende is not a recognized mineral, but is used as a general or field term to refer to a dark Amphibole . It is an isomorphous mixture of three Molecule s; a Calcium - Iron - Magnesium silicate, an Aluminium -iron-magnesium silicate, and an iron-magnesium silicate. Manganese , Titanium , and Sodium are sometimes present. Fluorine often substitutes for the Hydroxyl in the structure. the general formula can be given as (Ca,Na)2-3(Mg,Fe,Al)5(Al,Si)8O22(OH,F)2. Hornblende has a Hardness of 5 - 6, a Specific Gravity of 2.9 - 3.4, and is typically an opaque green, greenish-brown, brown or black. Hornblende is a common constituent of many , Hastingsite , and Tschermakite . The word hornblende is derived from the German ''horn'' and ''blende'', to blind or dazzle. The term ''blende'' is often used to refer to a brilliant non-metallic Luster , for example, Zincblende , and pitchblende, a lustrous form of Uraninite . SEE ALSO REFERENCES
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