Which is the best description of actinolite?
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Top best answers to the question «Which is the best description of actinolite»
- Actinolite belongs to the amphibole group of minerals and are included in the subclass of inosilicates. Actinolite is normally dark to light green in colour and occasionally occurs in shades of greyish-green to nearly black. Transparent well-developed crystals of Actinolite are rare and are faceted into small attractive gems for collectors.
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- Chlorastrolite also known as Isle Royale Greenstone, is a green or bluish green stone. Chlorastrolite has finely radiating or stellate (for examples, see crystal habits) masses that have a "turtleback" pattern. The stellate masses tend to be chatoyant, meaning they have a varying luster.
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- Rhodonite. Rhodonite is a manganese inosilicate, (Mn, Fe, Mg, Ca)SiO 3 and member of the pyroxenoid group of minerals, crystallizing in the triclinic system. It commonly occurs as cleavable to compact masses with a rose-red color (the name comes from the Greek ῥόδος rhodos, rosy), often tending to brown because of surface oxidation .
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We've handpicked 22 related questions for you, similar to «Which is the best description of actinolite?» so you can surely find the answer!
Which is the best description of apatite crystal?
- Jump to navigation Jump to search. Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, with high concentrations of OH −, F − and Cl − ions, respectively, in the crystal.
Which is the best description of azurite color?
- It is best known for its characteristic deep blue to violet-blue color. The blue color, known as "azure," is like the deep blue evening skies often seen above deserts and winter landscapes. Azurite is not a common or abundant mineral, but it is beautiful and its blue color attracts attention.
Which is the best description of celestine mineral?
- The Mineral celestine. Celestine is an attractive mineral that forms in well-shaped crystals with a distinctive soft blue color. Crystals may be a solid color, but may also have lighter and darker color zones of blue.
Which is the best description of a brilliant diamond?
- A brilliant is a diamond or other gemstone, cut in a particular form with numerous facets so as to have exceptional brilliance. The shape resembles that of a cone and provides maximized light return through the top of the diamond.
Which is the best description of a mineral wavellite?
- The Mineral wavellite. Wavellite is a classic radiating mineral, forming spectacular pinwheel aggregates emanating from a central core in spherulitic balls. When the balls are complete, the radial structure is internal and not usually visible. A crystal aggregate needs to be fractured to see and appreciate the outstanding radial habit of Wavellite.
Which is the best description of the mineral petalite?
- Petalite, also known as castorite, is a lithium aluminium phyllosilicate mineral LiAlSi 4O 10, crystallizing in the monoclinic system. Petalite is a member of the feldspathoid group. It occurs as colorless, grey, yellow, yellow grey, to white tabular crystals and columnar masses.
Which is more dangerous actinolite or chrysotile asbestos?
- Actinolite is a member of the amphibole class of asbestos minerals. Amphiboles break apart into small, straight, needle-like fibers that are easily airborne and pose a greater risk of inhalation and disease than the serpentine asbestos chrysotile.
Which is the correct chemical formula for actinolite?
- - Actinolite or Tremolite composed of tiny, interwoven, fibrous crystals that forms a tough, hairlike mass. - Form of Actinolite where the magnesium is wholly replaced by iron. Ferro-actinolite is scientifically regarded as a distinct mineral species with a chemical formula of Ca2Fe5Si8O22(OH)2
Which is the most common element in actinolite?
- Most Visited Gemstones Chemical Formula Ca2(Mg,Fe)5Si8O22(OH)2 Composition Basic calcium, magnesium, iron silicate Color Light to dark green; grayish green to bl ... Streak Colorless Hardness 5.5 - 6 16 more rows ...
Which is the most rare form of actinolite?
- Another gem variety is the chatoyant form known as cat's-eye actinolite. This stone is translucent to opaque, and green to yellowish green color. This variety has had the misnomer jade cat's-eye. Transparent actinolite is rare and is faceted for gem collectors. Major sources for these forms of actinolite are Taiwan and Canada.
Which is the pseudomorph of the mineral actinolite?
- - Pseudomorph of Actinolite after any mineral of the pyroxene group, especially Augite. Nephrite is one of the two minerals that form the important gemstone Jade. Jade is cut into cabochon s, beads, and earrings. Rings and bracelets are sometimes carved out of an entire mass of Jade. Ornamental sculptures and figures are also carved from this gem.
Is actinolite hazardous?
Is actinolite harmful? Non-fibrous actinolite (technically referred to as acicular actinolite) poses a low risk to human health and is not considered hazardous. The fibrous type of actinolite is an asbestiform material and once airborne can be hazardous to human health.
Does actinolite cure diseases?
Asbestos-related diseases. Asbestos comprises six naturally occurring substances: chrysotile (which belongs to the serpentine group of minerals), crocidolite, amosite, anthophyllite, tremolite and actinolite (all belonging to the amphibole group of minerals). Most of the world usage of asbestos has been chrysotile and much smaller amounts of crocidolite and amosite, whereas the other three amphiboles are important as contaminants of other minerals or agricultural soil. In the United Kingdom ...
How is actinolite made?
Actinolite is an intermediate member in a solid-solution series between magnesium-rich tremolite, Ca 2 (Mg 5.0-4.5 Fe 2+ 0.0-0.5)Si 8 O 22 (OH) 2, and iron-rich ferro-actinolite, ☐Ca 2 (Mg 2.5-0.0 Fe 2+ 2.5-5.0)Si 8 O 22 (OH) 2. Mg and Fe ions can be freely exchanged in the crystal structure. Like tremolite, asbestiform actinolite is regulated as asbestos. Occurrence
How rare is actinolite?
- Actinolites with more than 50% Fe are very rare. Catseye actinolite exists (S.G. 3.0, R.I. 1.63); when chatoyant material is cut, it exhibits a fine eye. Actinolite is easy to cleave and hard to cut and would make a poor jewelry stone. Actinolite is the chief constituent of nephrite (jade).
Is actinolite a jade?
There are several known varieties of actinolite:
Translucent Nephrite has a uniformity of color and is extremely tough. It is classified as Jade.
Is actinolite a pleochroic?
Color - Hornblende is generally pleochroic in shades of brown and green, less commonly yellow or red-brown. Concentric or patchy color zonation may be present. Actinolite is similar but colors are restricted to greens.
Is actinolite an amphibole?
Actinolite, an amphibole mineral in the tremolite-actinolite series of calcium, magnesium, and iron silicates. The minerals in this series are abundant in regionally metamorphosed rocks, such as schists.
Is actinolite rock dangerous?
are considered to be extremely hazardous.
Anthophyllite, actinolite and tremolite have been lumped with the “lesser evil” chrysotile under the UN Identification numbering system. All three of these amphi- boles also have non-asbestos forms associated with them in nature that are not harmful.
Is all actinolite asbestos?
No, actinolite is a mineralogical name for an amphibole silicate mineral. Some forms of this mineral are asbestiform and some are not.
Is jade an actinolite?
Actinolite asbestos was once mined along Jones Creek at Gundagai, Australia. Gemology. Some forms of actinolite are used as gemstones. One is nephrite, one of the two types of jade (the other being jadeite, a variety of pyroxene). Another gem variety is the chatoyant form known as cat's-eye actinolite. This stone is translucent to opaque, and green to yellowish green color.
What is actinolite jewelry?
- Actinolite Value, Price, and Jewelry Information. Actinolite is a member of a series that contains varying amounts of iron and magnesium. Tremolite is the Mg end, and ferroactinolite the Fe end, with actinolite in the middle.