Information about Zoisite
- This article is about the mineral named zoisite. For the Sailor Moon character, see Shitennou.
| Zoisite | |
|---|---|
) Anyolite (left) & tanzanite | |
| General | |
| Category | Silicate mineral |
| Chemical formula | (Ca2Al3(SiO4)(Si2O7)O(OH) |
| Identification | |
| Color | Gray, yellow, blue, green. |
| Crystal habit | Crystals flattened in an acicular manner, may be fibrously curved |
| Crystal system | Orthorhombic |
| Cleavage | Perfect {010} imperfect {100} |
| Fracture | Uneven to conchoidal |
| Mohs Scale hardness | 6.5 |
| Luster | Vitreous, pearly on cleavage surfaces |
| Refractive index | 1.69-1.70 |
| Optical Properties | biaxial positive |
| Birefringence | 0.006-0.018 |
| Pleochroism | Present, dichroism or trichroism depending on color. |
| Streak | White or colorless |
| Specific gravity | 3.10-3.38 |
| Major varieties | |
| tanzanite | Gem-quality zoisite, blue-purple |
| thulite | Pink |
| anyolite | Often found intergrown with ruby |
| chrome zoisite | Green, uncommon |
Zoisite is a calcium aluminium hydroxy sorosilicate belonging to the epidote group of minerals. Zoisite is named after the Slovene scientist Baron Sigmund Zois von Edelstein (Žiga Zois), who realized that this was an unknown mineral when it was brought to him by the mineral dealer Simon Prešern, who had discovered it in the Saualpe mountains (Svinška planina) of Carinthia in 1805. Zoisite was first known as saualpite, after its type locality. Transparent material is fashioned into gemstones while translucent-to-opaque material is usually carved into sculptural works. The latter is sometimes shot through with ruby crystals, which are completely opaque and unsuited to use as gems, yet are well colored and contrast strikingly against the green matrix of the zoisite.
Zoisite occurs as prismatic, orthorhombic (2/m 2/m 2/m) crystals or in massive form, being found in metamorphic and pegmatitic rock. Zoisite may be blue to violet, green, brown, pink, yellow, gray, or colorless. It has a vitreous luster and a conchoidal to uneven fracture. When euhedral, zoisite crystals are striated parallel to the principal axis (c-axis). Also parallel to the principal axis is one direction of perfect cleavage. Zoisite is somewhat higher than 6 in hardness and its specific gravity is between 3.10 - 3.38, depending on the variety. Zoisite streaks white and is said to be brittle. Clinozoisite is a more common monoclinic polymorph of zoisite.
Sources of zoisite include Tanzania (tanzanite), Kenya (anyolite), Norway (thulite), Switzerland, Austria, India, Pakistan, and Washington in the USA.
See also
References
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., ISBN 0-471-80580-7
- Mineral Handbook, 2001, Mineral Data Publishing
- Webmineral data
- Mindat.org
The Shitennou (四天王 Shitennō
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A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound. A chemical formula is also a short way of showing how a chemical reaction occurs.
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habit of crystals.
The many terms used by mineralogists to describe crystal habits are useful in communicating what specimens of a particular mineral often look like. Recognizing numerous habits helps a mineralogist to identify a large number of minerals.
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The many terms used by mineralogists to describe crystal habits are useful in communicating what specimens of a particular mineral often look like. Recognizing numerous habits helps a mineralogist to identify a large number of minerals.
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A crystal system is a category of space groups, which characterize symmetry of structures in three dimensions with translational symmetry in three directions, having a discrete class of point groups.
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orthorhombic crystal system is one of the 7 lattice point groups. Orthorhombic lattices result from stretching a cubic lattice along two of its lattice vectors by two different factors, resulting in a rectangular prism with a rectangular base (a by b
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Cleavage, in mineralogy, is the tendency of crystalline materials to split along definite planes, creating smooth surfaces, of which there are several named types:
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- Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes.
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fracture is the (local) separation of a body into two, or more, pieces under the action of stress.
The word fracture is often applied to bones of living creatures, or to crystals or crystalline materials, such as gemstones or metal.
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The word fracture is often applied to bones of living creatures, or to crystals or crystalline materials, such as gemstones or metal.
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The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German mineralogist Friedrich Mohs and is one of several definitions of hardness in
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For other senses of this word, see lustre.
Lustre (American English: luster) is a description of the way light interacts with the surface of a crystal, rock, or mineral.
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The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. For example, typical glass has a refractive index of 1.
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Birefringence, or double refraction, is the decomposition of a ray of light into two rays (the ordinary ray and the extraordinary ray) when it passes through certain types of material, such as calcite crystals or boron nitride, depending on the polarization of
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Dichroism has two related but distinct meanings in optics. A dichroic material is either one which causes visible light to be split up into distinct beams of different wavelengths (colours) (not to be confused with dispersion), or
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The streak (also called powder color) of a mineral is the color of the powder produced when it is dragged across an unweathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a
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Tanzanite is the blue/purple variety of the mineral zoisite discovered in the Meralani Hills of northern Tanzania in 1967, near the city of Arusha. It is a popular and valuable gemstone when cut, although its durability is somewhat lacking; its tendency to break sometimes
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Thulite (sometimes called rosaline) is an opaque, massive pink manganese rich variety of the mineral zoisite. Thulite is often mottled with white calcite and occurs as veins and fracture fillings transecting many types of rock.
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Anyolite is considered a variety of the mineral zoisite. Found in Kenya and Tanzania, anyolite is actually a metamorphic rock composed of intergrown green zoisite, black hornblende, and ruby. It is said to be named after the Maasai word anyoli, meaning "green.
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Ruby is a light pink to blood red gemstone, a variety of the mineral corundum (aluminium oxide). The common red color is caused mainly by the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires.
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Calcium (IPA: /ˈkalsiəm/) is the chemical element in the periodic table that has the symbol Ca and atomic number 20. It has an atomic mass of 40.078.
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Aluminium (IPA: /ˌæljʊˈmɪniəm/, /ˌæljəˈmɪniəm/) or aluminum (IPA: /əˈluːmɪnəm/
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Hydroxy can refer to:
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- In chemical nomenclature, the prefix "hydroxy-" shows the presence of a hydroxyl functional group (-OH)
- An abbreviation for the medication hydroxyzine, which is commonly sold under the brand names Atarax, Ucerax, Serecid, and Vistaril.
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The silicate minerals make up the largest and most important class of rock-forming minerals. They are classified based on the structure of their silicate ion group.
Subclasses:
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Subclasses:
Nesosilicates or Isosilicates
Nesosilicates (or orthosilicates..... Click the link for more information.
Epidote is a calcium aluminium iron sorosilicate mineral, Ca2(Al, Fe)3(SiO4)3(OH), crystallizing in the monoclinic system. Well-developed crystals are of frequent occurrence: they are commonly prismatic in habit, the direction of
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A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure and specific physical properties.
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Motto
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Anthem
7th stanza of Zdravljica
"A Toast"
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Anthem
7th stanza of Zdravljica
"A Toast"
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Sigmund Zois (Žiga Zois) (23 November 1747 in Trieste - 10 November 1819 in Ljubljana) studied natural sciences with Gabriel Gruber and Joseph Maffei in Ljubljana.
Sigmund was born in Ljubljana (capital of present Slovenia) in 1747.
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Sigmund was born in Ljubljana (capital of present Slovenia) in 1747.
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Duchy of Carinthia (German: Herzogtum Kärnten; Slovenian: Koroška) was a duchy located in southern Austria and parts of northern Slovenia.
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GemStone can mean:
A gemstone, gem or also called
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- Gemstone, a type of mineral
- GemStone IV (or GemStone III), an online multiplayer game by Simutronics Corporation
- GemStone Systems, a data management company
A gemstone, gem or also called
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