WebBloodstone is a forest green jasper with bright red spots of iron oxide probably hematite. The green color comes from amphibole, chlorite, and pyroxene inclusions in the chalcedony. The red spots are supposed to signify the blood of Christ. The stone is also known as heliotrope gets its name from Greek hḗlios (sun) and trépein (to turn). WebIt has a chemical formula of Ca5(PO4,CO3)3(OH,F). Also known as Carbonate-rich Apatite. Chlorapatite - Individual member mineral of the Apatite group with chlorine being dominant in its structure. For a short period of time, it was renamed by the IMA as Apatite- (CaCl), but is now again favored again as Chlorapatite. Collophane
Peridot — RAF - Rare Antique Fine Jewels : Jewels for Generations
WebPeridot, spinel and sardonyx are the three birthstones for August. The peridot birthstone is known for being formed under extreme conditions, as it can be found in the hardened lava that carried it from deep within Earth’s … how tall is actor james whitmore jr
Peridot Description - Gemological Institute of America
Peridot has the formula of (Mg, Fe) 2 SiO 4. Peridot is one of the birthstones for the month of August. [1] Etymology and Appearance: The origin of the name "peridot" is uncertain, possibly derived from Anglo-Norman or Arabic words. It is a gemstone that occurs only in an olive-green color, with its intensity and tint … See more Peridot , sometimes called chrysolite, is a deep yellowish-green transparent variety of olivine. Peridot is one of the few gemstones that occurs in only one color. Peridot can be found in mafic and ultramafic rocks occurring … See more The origin of the name peridot is uncertain. The Oxford English Dictionary suggests an alteration of Anglo–Norman pedoretés (classical Latin pæderot-), a kind of opal, rather than the Arabic word faridat, meaning "gem". The See more Geologically Olivine, of which peridot is a type, is a common mineral in mafic and ultramafic rocks, … See more Peridot has been prized since the earliest civilizations for its claimed protective powers to drive away fears and nightmares, according to superstitions. It is believed by some … See more Peridot is one of the few gemstones that occur in only one color: an olive-green. The intensity and tint of the green, however, depends on the … See more Crystal structure The molecular structure of peridot consist of isomorphic olivine, silicate, magnesium and iron in an orthorhombic crystal system. In an alternative view, the atomic structure can be described as a hexagonal, close-packed array … See more All minerals that are orthorhombic, like peridot, are biaxial and are defined by three principal axes: α, β, γ. Refractive index readings of faceted gems contain indices α = 1.653, β = 1.670, … See more http://webmineral.com/data/Forsterite.shtml WebGem variety of the mineral olivine: found in peridotite rock from the earth’s upper mantle. Facts Mineral: Olivine Chemistry: (MgFe) 2 SiO 4 Color: Yellowish green Refractive index: 1.65 to 1.69 Birefringence: 0.035 to … how tall is actor joel kinnaman