The secondary mineral begins to form upon the surfaces and along the cracks of the olivine, gradually producing a mesh-work in the interstices of which small kernels of olivine remain; and when the process is completed the mesh structure persists in the resulting pseudomorph, giving
1911 Encyclopædia Britannica/Celestine (mineral See also Celestine (mineral) on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer. 2033051 1911 Encyclopædia Britannica , Volume 5 Celestine (mineral) CELESTINE, or Celestite , a name applied to native strontium sulphate (SrSO 4 ), having been suggested by the celestial blue colour which it occasionally presents.
See also Jacinth and Zircon on Wikipedia; also Leshem; and our 1911 Encyclopædia Britannica disclaimer. 2148183 1911 Encyclopædia Britannica , Volume 14 Hyacinth (mineral) HYACINTH, or Jacinth , in mineralogy, a variety of zircon ( q.v. ) of yellowish red colour, used as a gem-stone.
1911 Encyclopædia Britannica/Lamprophyres - Wikisource Their essential minerals in thin section are hornblende of a strong reddish-brown colour; augite purple, pleochroic and rich in titanium, olivine and plagioclase felspar. They have the porphyritic and panidiomorphic structures described in the rocks of the previous group, and like them also have an ocellar character, often very conspicuous
1911 Encyclopædia Britannica/Olivine - Wikisource, the See also Olivine on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer. OLIVINE, a rock-forming mineral composed of magnesium and ferrous orthosilicate, the formula being (Mg,Fe) 2 SiO 4. The name olivine, proposed by A. G. Werner in 1790, alludes to the ohve-green colour commonly shown by the mineral.
Home >> Encyclopedia-britannica-volume-9-part-2-extraction-gambrinus >> Fulk Nerra to Galatz >> Gabbro Gabbro Loading. GABBRO, in petrology a group of plutonic basic rocks, holo crystalline and usually rather coarse-grained, consisting essentially of a basic plagioclase felspar and one or more ferro-magnesian minerals (such as augite
Olivine - CAMEODescription. An olive green color magnesium iron silicate mineral. Olivine occurs in igneous and metamorphic rocks and has two compositional varieties:Fayalite (iron rich) and forsterite (magnesium rich). Olivine beads have been found in pre-Dynastic Egyptian jewelry.
Olivine - Clark Science CenterPhotomicrograph of olivine in basalt in crossed polars with cleavage planes parallel to crosshairs of microscope, showing "extinct" view. Select the image and then move cursor over image to view the stage rotated 45 degrees, where the mineral shows maximum transmitted light. These two images demonstrate the extinction angle of olivine.
Olivine is a solid solution series mineral whose two most common end members are forsterite (Mg) and fayalite (Fe). This page concerns itself with olivine in general. If you need end member-specific information, please see the forsterite and fayalite pages.
Olivine Definition of Olivine by Merriam-WebsterOlivine definition is - a usually greenish mineral that is a complex silicate of magnesium and iron used especially in refractories.
Olivine How To - 01/2021Olivine mineral Britannica Best britannica. Olivine, any member of a group of common magnesium, iron silicate minerals. Olivines are an important rock-forming mineral group. Magnesium-rich olivines are abundant in low-silica mafic and ultramafic igneous rocks and are believed to be the most abundant constituent of the Earths
Olivine Crystallography:Axial Ratios:a:b:c =0.4663:1:0.6146 :Cell Dimensions:a = 4.78, b = 10.25, c = 6.3, Z = 4; V = 308.67 Den(Calc)= 3.30
Olivine Mineral Physical - Optical Properties, Uses Olivine Uses. Olivine is a mineral that isnt regularly utilized in enterprise. Most olivine is used in metallurgical strategies as a slag conditioner. High-magnesium olivine (forsterite) is introduced to blast furnaces to take away impurities from metallic and to shape a slag. Olivine has also been used as a refractory material.
Olivine:The mineral Olivine, peridot information and picturesChemical Formula:The Olivine group is composed of the following primary members:Forsterite:Mg 2 SiO 4 Olivine ():(Mg,Fe) 2 SiO 4Fayalite:Fe 2 SiO 4 The intermediary variety, Olivine, is not scientifically recognized as a separate mineral, but is nevertheless well-established. The mineral Tephroite (Mn 2 SiO 4), which many consider a member of the Olivine group, forms a series with
Analyses show that the mineral contains H 4 Mg 3 Si 2 0 9j and if the water be regarded as constitutional the formula may be written Mg 2 (SiO 4) 2 H 3 (MgOH). Serpentine occurs massive, fibrous, lamellar or granular, but never crystallized.
mineral - Students Britannica Kids Homework HelpOlivine, augite, and feldspar are among the minerals commonly found in basalts. Rhyolites may include varieties of quartz and feldspar. Obsidian is a glasslike igneous rock rich in silica that is produced when certain kinds of lava cool so rapidly that the individual minerals do not crystallize.Peridot gemstone BritannicaPeridot, also called precious olivine, gem-quality, transparent green olivine in the forsteritefayalite series (q.v.). Gem-quality olivine has been valued for centuries; the deposit on Jazrat Zabarjad (Saint Johns Island), Egypt, in the Red Sea that is mentioned by Pliny in his Natural History (ad 70) still produces fine gems.