User:ChloejWard/Hornblende

Intro

Hornblende is a complex inosilicate series of minerals. It is not a recognized mineral in its own right, but the name is used as a general or field term, to refer to a dark coloured amphiboles. Hornblende minerals are common and primarily found in igneous and metamorphic rocks. ( I took this from the wiki article im editing to change phrasing, this is not fully my own intro. The rest of the information in the sandbox is)

Intro

Hornblende

Physical Properties
- crystalizes in monoclinic system

- prismatic crystal habit

- most primary characteristic is 2 clevages that intersect at 120 and 60 degrees

- often euhedral - clearly visible elongate columnar prismatic crystals

Hornblende is identified most easily by it's colour, typically black but also dark green and dark brown as well as two directions of cleavage that intersect at 120 and 60 degrees.

Article body
- formed in metamorphic and igneous rocks

Hornblende is a rock forming mineral that is an important constituent in intermediate igneous rocks, specifically, granite, diorite, syenite, andesite, and rhyolite. It is found in the metamorphic rocks gneiss and schist.

Amphibolites are rocks which consist mainly of amphibole minerals, most abundantly hornblende, although these rocks are rare.

Uses of Hornblende
Hornblende has been used to estimate the depth of crystallization of plutonic rocks. Those with low aluminum content are associated with shallow depths

Independently hornblende has few uses, but as the most present mineral in amphibolite has many uses. Amphibolite