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2. Elbaite - Wikipedia

   en.wikipedia.org/wiki/Elbaite

   Elbaite, a sodium, lithium, aluminium boro - silicate, with the chemical composition Na (Li 1.5 Al 1.5 )Al 6 Si 6 O 18 (BO 3) 3 (OH) 4, [ 4] is a mineral species belonging to the six-member ring cyclosilicate tourmaline group. Elbaite forms three series, with dravite, with fluor-liddicoatite, and with schorl. Due to these series, specimens with ...

3. Taaffeite - Wikipedia

   en.wikipedia.org/wiki/Taaffeite

   Taaffeite ( / ˈtɑːfaɪt /; BeMgAl 4 O 8) is a mineral, named after its discoverer Richard Taaffe (1898–1967) who found the first sample, a cut and polished gem, in October 1945 in a jeweler's shop in Dublin, Ireland. [ 4][ 5] As such, it is the only gemstone to have been initially identified from a faceted stone.

4. Corundum - Wikipedia

   en.wikipedia.org/wiki/Corundum

   Corundum. Corundum is a crystalline form of aluminium oxide ( Al2O3) typically containing traces of iron, titanium, vanadium, and chromium. [ 3][ 4] It is a rock -forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [ 7]

5. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   The normal primary and secondary hues in tanzanite are blue and violet. Untreated tanzanite is a trichroic gemstone, meaning that light that enters this anisotropic crystal gets refracted on different paths, with different colour absorption on each of the three optical axes. As a result of this phenomenon, a multitude of colors have been ...

6. Tourmaline - Wikipedia

   en.wikipedia.org/wiki/Tourmaline

   Rarely, it can be found as neon green or electric blue. Tourmaline ( / ˈtʊərməlɪn, - ˌliːn / TOOR-mə-lin, -⁠leen) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. This gemstone comes in a wide variety of colors.

7. Pegmatite - Wikipedia

   en.wikipedia.org/wiki/Pegmatite

   Pegmatite. A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite.

8. Viola sororia - Wikipedia

   en.wikipedia.org/wiki/Viola_sororia

   Viola sororia ( / vaɪˈoʊlə səˈrɔːriə / vy-OH-lə sə-ROR-ee-ə ), [ 5] known commonly as the common blue violet, is a short-stemmed herbaceous perennial plant native to eastern North America. It is known by a number of common names, including common meadow violet, purple violet, woolly blue violet, hooded violet, and wood violet.

9. Riebeckite - Wikipedia

   en.wikipedia.org/wiki/Riebeckite

   Riebeckite. Riebeckite is a sodium -rich member of the amphibole group of silicate minerals, chemical formula Na 2 (Fe 2+3 Fe 3+2 )Si 8 O 22 (OH) 2. It forms a solid solution series with magnesioriebeckite. It crystallizes in the monoclinic system, usually as long prismatic crystals showing a diamond-shaped cross section, but also in fibrous ...