What type of silicate is amphibole?
hydrous silicates
Amphiboles have hydroxyl groups in their structure and are considered to be hydrous silicates that are stable only in hydrous environments where water can be incorporated into the structure as (OH)-.
Is amphibole a dark silicate mineral?
The dark silicates are also called ferromagnesian because of the presence of iron and magnesium in them. They include olivine, pyroxene, amphibole and biotite. The light-colored silicates include quartz, muscovite and feldspar.
What are some amphibole minerals?
Four of the amphibole minerals are among the minerals commonly called asbestos. These are: anthophyllite, riebeckite, the cummingtonite/grunerite series, and the actinolite/tremolite series.
What is the variety of amphibole mineral group?
Introduction
| Mineral group | Asbestos variety | Nominal chemical formulaea |
|---|---|---|
| Amphibolec | Amosite | (Fe2+Mg)7Si8O22(OH)2 |
| Amphibole | Crocidolite | Na2Fe3+(Fe2+Mg)3Si8O22(OH)2 |
| Amphibole | Anthophyllite | Mg7Si8O22(OH)2 |
| Amphibole | Actinolite | Ca2Fe42+MgSi8O22(OH)2 |
Is olivine a mineral?
Olivine is a group of silicate minerals with a generalized composition of A(2)SiO(4). The composition of common olivine minerals are listed below: Forsterite: Mg (2) SiO (4)
Is amphibole a mineral or rock?
metamorphic rock
Amphibolite is a dark, heavy, metamorphic rock composed mostly of the mineral amphibole. Amphibolites have very little to no quartz. “Amphibole” refers not to a single mineral, but to a group of minerals.
What type of rock is olivine?
igneous rocks
Olivine is most commonly found in igneous rocks of low silica content, such as basalts and gabbros, and is occasionally found in metamorphic rocks.
What is the silicate structure of muscovite?
Muscovite is a member of the mica group of silicate minerals (sheet silicates) in which the base of all of the SiO 4 tetrahedra lie in one plane and three corners of the base are shared with the neighbouring tetrahedra.
Is olivine a silicate?
Olivine is a group of silicate minerals with a generalized composition of A(2)SiO(4). The composition of common olivine minerals are listed below: Forsterite: Mg (2) SiO (4) Fayalite: Fe (2) SiO (4)
What type of mineral is olivine?
olivine, any member of a group of common magnesium, iron silicate minerals.
What minerals are in olivine?
Olivine incorporates only minor amounts of elements other than oxygen (O), silicon (Si), magnesium (Mg) and iron (Fe). Manganese (Mn) and nickel (Ni) commonly are the additional elements present in highest concentrations.
Is Muscovite a silicate?
Muscovite, also called common mica, potash mica, or isinglass, abundant silicate mineral that contains potassium and aluminum. Muscovite is the most common member of the mica group. Muscovite typically occurs in metamorphic rocks, particularly gneisses and schists, where it forms crystals and plates.
What kind of minerals are found in amphibolite rocks?
Minerals Database. Amphibole. Amphibolite is a dark, heavy, metamorphic rock composed mostly of the mineral amphibole. Amphibolites have very little to no quartz. “Amphibole” refers not to a single mineral, but to a group of minerals. Most belong to the monoclinic crystal system, but some belong to the orthorhombic crystal system.
Where can you find amphiboles in a rock?
Amphiboles occur in both metamorphic and igneous rocks, frequently as dark elongated grains and crystals embedded in the rock, but can occasionally form well developed crystals. Such crystals are most commonly found in pegmatites and as porphyroblasts in igneous rocks, marbles/skarns and veins within metamorphic rocks.
What kind of crystal system does an amphibole have?
Amphiboles crystallize into two crystal systems, monoclinic and orthorhombic. In chemical composition and general characteristics they are similar to the pyroxenes.
What can be substituted for silicon in the amphibole formula?
Aluminum can partially substitute for silicon in the tetrahedral ( T) site. Partial substitution of fluorine (F), chlorine, and oxygen for hydroxyl (OH) in the hydroxyl site is also common. The complexity of the amphibole formula has given rise to numerous mineral names within the amphibole group.
