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Durr Al Najaf. Durr Al Najaf ( Arabic: دُر ٱلنَّجَف) is a glossy and clear gemstone from the quartz family. The name means "pearl of Najaf " as it can only be sourced from Wadi-al-Salaam ( Arabic: وادي السلام, romanized : Wādī al-Salām, lit. 'Valley of Peace') in Najaf, Iraq. The gemstone is found along the west of Najaf ...
High quality quartz crystals are single-crystal silica with optical or electronic properties that make them suitable for hardstone carvings. The Hindu temples in South India use this semi-precious mineral for making Shiva Lingams. Sphatikam beads are made from translucent rose quartz are cut and polished as beads.
Quartz monzonite. Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase.
Mineral symbols are most commonly represented by three-lettered text symbols, although one-, two- and four-lettered symbols also exist. Four methods of nomenclature are used: [ 3 ][ 5 ] The initial letters of a name, for example: cyanotrichite: Cya and mitscherlichite: Mits. A combination considered characteristic of the mineral name, for ...
Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species . Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety .
Epidote is an abundant rock-forming mineral, but one of secondary origin. It occurs in marble and schistose rocks of metamorphic origin. It is also a product of hydrothermal alteration of various minerals ( feldspars, micas, pyroxenes, amphiboles, garnets, and others) composing igneous rocks. A rock composed of quartz and epidote is known as ...
Rutilated quartz used as a gemstone. Rutilated quartz is a variety of quartz which contains acicular (needle-like) inclusions of rutile. [ 1] It is used for gemstones. These inclusions mostly look golden, but they also can appear silver, copper red or black. The inclusions may be distributed randomly or in bundles, which sometimes are arranged ...
Hedenbergite, Ca Fe Si 2 O 6, is the iron rich end member of the pyroxene group having a monoclinic crystal system. The mineral is extremely rarely found as a pure substance, and usually has to be synthesized in a lab. It was named in 1819 after M.A. Ludwig Hedenberg, who was the first to define hedenbergite as a mineral.
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