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https://www.jtv.com/library/article/gemstone-glossary
Apr 01, 2011 · Chemically it is an iron-aluminum silicate, but is rarely pure in nature. Almandite is very popular in jewelry since it is hard (7.5) and durable. Important sources include Brazil, India, Madagascar, Sri Lanka, and the USA.
https://www.gemsociety.org/article/hardness-and-wearability/
In practical terms, gems softer than quartz will lose their polish and become dull simply from cleaning. A 7 or higher on the Mohs scale usually indicates a gem is hard enough for normal jewelry use. This is a guideline, not a hard and fast rule. Pearls and opals are some of …
http://jewellery.org.ua/stones-katalog-engl/mineral-turmalin.htm
Any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery.
https://fashionhance.com/common-metals-used-in-jewelry-making
Tungsten carbide, a compound of tungsten and carbon, is used to make jewelry. It is a very hard metal and can be scratched only by diamond. An advantage of tungsten jewelry is that it is hypoallergenic. But, there are limited jewelry options in tungsten, restricting its popularity.
https://www.thoughtco.com/what-are-abrasive-minerals-1439101
Mar 06, 2019 · Pumice is a stone, not a mineral, a volcanic product with a very fine grain. Its hardest mineral is quartz, so it has a gentler action than sanding abrasives. Softer still is feldspar (Mohs 6), which is most famously used in the Bon Ami brand household cleaner.
https://www.answers.com/Q/Hard_shiny_crystals_used_in_jewelry_are_called
The chemical element that is hard, black, and shiny is boron. Boron is a metalloid found in Group 13, and it has the atomic number of 5 on the periodic table. Are borax crystals hard?
http://gem5.com/tag/black/
Black Gemstones & Minerals Jet Lignite: Jet is an organic gem material composed of lignite, and is a bituminous coal which can be polished. It is compact, homogeneous, has a hard, glossy surface and black interior variety of fossilized lignite or coal.
http://snippets.com/what-minerals-are-used-for-jewelry.htm
One of the most popular minerals used in jewelry are the quartz based gems. Amethyst, citrine, rose quartz, agate, smokey quarts and even clear rock crystal are extensively used. Quartz is a very hard and durable mineral and comes in a wide variety of colors and patterns making it …
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