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Unakite is a metamorphic rock that is altered granite composed of pink orthoclase feldspar, ... A good quality unakite is considered a semiprecious stone; ...
Eclogite (/ ˈ ɛ k l ə dʒ aɪ t /) is a metamorphic rock containing garnet (almandine-pyrope) hosted in a matrix of sodium-rich pyroxene . Accessory minerals include kyanite, rutile, quartz, lawsonite, coesite, amphibole, phengite, paragonite, zoisite, dolomite, corundum and, rarely, diamond. The chemistry of primary and accessory minerals ...
Title page of a printed lapidary by Conrad Gessner of 1565. A lapidary is a text in verse or prose, often a whole book, that describes the physical properties and metaphysical virtues of precious and semi-precious stones, that is to say, a work on gemology. [1]
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
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Suevite from the Nördlinger Ries impact crater (type locality) Portal to the town hall's stairway made of suevite in Nördlingen, Germany. Suevite is a rock consisting partly of melted material, typically forming a breccia containing glass and crystal or lithic fragments, formed during an impact event.
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 ...
A larvikite quarry in Larvik, Norway, 2008 Polished larvikite (marketed as "Blue Pearl Granite"), showing labradorescence, is a popular decorative stone. Light larvikite with a polished surface Larvikite is an igneous rock , specifically a variety of monzonite , [ 1 ] notable for the presence of thumbnail-sized crystals of feldspar .
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