Which mineral is often called hornblende?
Which mineral is often called hornblende?
calcium aluminum amphiboles
The hornblende Mineral Group. Hornblende is a group name used to describe Ferro-hornblende and Magnesio-hornblende, but the term is generally more inclusive for all calcium aluminum amphiboles. (Hornblende is frequently also used to describe any dark, opaque amphibole mineral without individual analysis.)
Where in the world is hornblende found?
Igneous and metamorphic rocks containing hornblende are widespread throughout Wisconsin’s Precambrian shield. ASHLAND COUNTY: Large hornblende crystals are found in a mafic pegmatite dike found about 2 miles north of Mellen in the SW Sec.
Where is hornblende found in US?
Hornblende is a metamorphic rock and can be mixed with Feldspar, Quartz or Mica to form Granite. It also occurs as dark crystals in Marble. Hornblende deposits are located in near Mount Vesuvius and in Norway, Sweden, Italy, Canada (Ontario) and the United States (Massachusetts, New Hampshire, New Jersey, New York).
What is unique about hornblende?
Hornblende alters easily to chlorite, biotite, or other mafic minerals. A rare variety of hornblende contains less than 5% of iron oxide, is gray to white in color, and is named edenite from its locality in Edenville, Orange County, New York.
Is hornblende a silicate or non silicate?
A single chain silicate mineral. A double-chain ferromagnesian silicate mineral (e.g., hornblende). A sheet silicate mineral (e.g., biotite).
Is hornblende a granite?
Not only is hornblende often found in granite, but also in syenite, gabbro, basalts, gneisses, schists, and a wide array of other rock types. The calcium-rich amphibole, which generally ranges in color from a pure green to greenish-black, usually develops as short, thick prismatic crystals.
How common is hornblende?
Hornblende is a common constituent of many igneous and metamorphic rocks such as granite, syenite, diorite, gabbro, basalt, andesite, gneiss, and schist. It crystallizes in preference to pyroxene minerals from cooler magma that is richer in silica and water.
