Amphibole defines an important group of generally dark-colored rock-forming inosilicate minerals, composed of double chain SiO4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their structures.
Amphibole Minerals
A photo gallery of amphibole minerals.
Calcite Clues
This common mineral is being used as a gauge of tectonic stress and strain.
Amphibole: A common mineral composed of silicate of magnesium and calcium, (with usually aluminum and iron), which occurs in monoclinic crystals and comes in many varieties, each varying in color and in composition.
Amphibole (Robinson, 1825, Whitlock, 1903; Manchester, 1931)
Apatite (Beck, 1842; Mather, 1843; Whitlock, 1903; Manchester, 1931)
Barite (Robinson, 1825) ...
Amphiboles...A group of closely related, dark colored rock forming silicate minerals, as in, actinolite, hornblende.
Amphibole: A rock forming mineral composed of magnesium-iron silicates with traces of other elements.
Amulet: A charm worn for good luck or to ward off evil.
Angelskin Coral: A pale pink coral. One of the most expensive.
amphibole group (amphibole) Group of minerals that contain iron, magnesium, silicon, oxygen, and hydroxyl (OH). They may also contain calcium, sodium, and lithium.
The first mineral, nephrite, is an amphibole silicate (basic magnesium iron silicate) in the actinolite series and is usually only green and creamy white.
Finding them different from ordinary Chinese jade (amphibole jade, or nephrite), he named the "new" jade, jadeite.
Those inosilicate species which are composed of single chains are classified as the pyroxenes, while those which are constructed of double chains are termed the amphiboles.
The asterism of the star garnets is caused by asbestiform pyroxene and amphibole inclusions.
Basic igneous rocks (BIR) include basalts, dolerites, gabbros, kimberlites, and peridotites, and abundant minerals in such rocks include olivine, pyroxenes, Ca-feldspar (plagioclase), amphiboles, and biotite.
Lapis Lazuli or Lapis - Lapis may contain other minerals, such as calcite, pyrite, amphibole, apatite, diopside, feldspar, sphene, and zircon. The name comes from Arabic "allazward" meaning sky or blue.
Nephrite is a variety of the calcium and magnesium rich amphibole mineral, Actinolite. It is one of two different mineral species called Jade. The other mineral species known as Jade is Jadeite, which is a variety of Pyroxene.
Nephrite is, then, a calcium-magnesium silicate that varies from translucent to opaque, and from shades of green, through browns and yellows to greys and near whites as it varies in the proportion of the amphibole minerals in its makeup.
nephrite jade - An exceptionally tough, translucent to opaque member of the tremolite-actinolite series of the amphibole group, the less rare and valuable of the two kinds of jade minerals.
Tremolite: A white or pale green mineral of the amphibole group composed of calcium magnesium silicate and used as a form of asbestos. The compact variety of tremolite, called nephrite, is a form of jade.
Triangle cut: See Trillion-cut.
At Lugar, a former coal-mining community in south Ayrshire, the less common amphibole group mineral, kaersutite, can be found as embedded crystals in the rock termed lugarite (a type of ijolite), which comprises part ...
Jadeite is a sodium-rich aluminous pyroxene; nephrite is a fine-grained, calcium-rich, magnesium, iron, aluminous amphibole.
Nephrite, a silicate of calcium and magnesium of the amphibole group, is a mineral with a fibrous crystalline structure. Nephrite is a white to dark green variety of jade, chiefly a metasilicate of iron, calcium, and magnesium.
Felsic Granite (Hornblende, Muscovite, Orthoclase)
Mafic Pegmatite (Amphibole, Micas, Olivine, Pyroxene)
Ultramafic Kimberlite, Lamproite (Garnet, Olivine, Peridotite, Phlogopite, Pyroxene) ...
Chemical composition -- A fibrous variety of the amphibole mineral series actinolite to tremolite, usually closer to actinolite.
If there is a good pinacoidal cleavage parallel to the b axis (as in the mineral orthoclase), then it is usually called the basal cleavage. In the monoclinic pyroxenes and amphiboles, where there are 2 equivalent cleavage directions, ...
gneiss
Gneiss is a coarse-grained type of metamorphic rock that usually has light and dark bands (the bands are formed by the recrystallization of quartz, feldspars, micas and amphiboles).
Karat Percent Gold
24 Kt.
Jade and Nephrite are considered Jade, the only difference is their chemical makeup. These are ornamental stones and are two forms of silicate. Jadeite is pyroxene while Nephrite is a form of amphibole.
by the Swiss Gemologist Eduard Gubelin; the local called the stone maw-sit-sit, and the name was retained. Although its exact composition is still unknown, Maw-sit-sit is composed of chromite, ureyite, chrome jadeite, symplektite, chrome amphibole, ...
 See also: Mineral, Minerals, Crystal, Color, Stone
|
