Achroite
Achroite is named after the Greek word achroos, meaning "without color"
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Achroite: colorless (from the Greek word for ‘colorless')
Dravite: dark yellow to brownish black
Elbaite: pink or green, also multicolored
Indicolite: intense indigo to ink-blue ...
Achroite, Dravite, Indigolite/Indicolite, Rubellite, Schorl, Verdelite
Turquoise
Turquoise ...
(ACHROITE, RUBELLITE, INDICOLITE, VERDELITE, WATERMELON)
Tourmaline, from the singhalese tourmali, meaning mixed stone, is an extremely complex group of hydrous minerals containing Li, Al, B, and Si, ...
see Dioptase Achroite.... see colorless Tourmaline Actaeonella... fossil sea snail from Austria Acmite ... aegerine
sodium iron silicate: (Ca,Na)(Mg,Fe,Al)(Si,Al)2O6 ...
These include rubellite (pink to red), indicolite (blue), schorl (black), dravite (brown) and achroite (colorless).
Tourmaline boasts a number of rather amazing physical characteristics.
Names such as achroite, Paraíba, rubellite, tsilaisite and verdelite are all used to describe different varieties/colors of elbaite or dravite.
4: Topaz & Tourmaline (Rubellite, Indicolite, & Achroite)
Ch. 5: Garnet Group
Ch. 6: Beryl ... Euclase
Ch. 7: Quartz Group
Ch. 8: Spodumene, ... Lapis Lazuli
Ch. 9: Feldspar Group
Ch. 10: Chiastolite, ... Fluorite ...
"Achroite" is the colorless variety of Tourmaline. The most popular form of Tourmaline is "Verdelith" or the green variety. Tourmaline derives its name from the Sinhalese word "tura mali", which means stone of mixed colors.
Occurrence
Madagascar and the United States. Named "achroite", after the greek word "achroos", which means "without color".
It ranges in color from pink to green to red (rubellite) to purple to blue-green (indicolite) to colorless (achroite) to black. Watermelon tourmaline is both pink and green.
Mineralogists gave tourmaline a variety of names, such as elbaite, tsilaisite, dravite, chromdravite, liddicoatite, uvite, schorl, achroite, buergerite, feruvite, foitite, povondraite and rubellite.
There is a large range of varieties of tourmaline including the Achroite, Dravite, Indicolite, Rubellite, Uvite, Tsilaisite, Schorl, Liddicoatite, Elbaite, Sibertite, and Verdelite ...
Pink Tourmaline - It is available widely thus is reasonably priced. It is more apposite for females as it encourages female balance and security.
Colourless Tourmaline : As the name specifies it is having no colour. It is called as Achroite and ...
usually called simply tourmaline, with a color adjective to specify the particular color, as, for example, the "pink tourmaline" of California. Red tourmaline is, however, sometimes called "rubelite," and white tourmaline has been called "achroite.
We also found several specimens covered with little crystals of tricolored tourmaline and even colorless tourmaline (achroite). It is, however, illusory to imagine gathering beautiful crystals if one has only a geologist’s hammer.
Gemstone Physical Characteristics: This Tourmaline group includes Rubellite (pink to red), Indicolite (blue), Schorl (black), Dravite (brown) and Achroite (colourless).
Gemstone Colour Variations: Very varied.
Lighter colors are considered more valuable than the darker. It ranges in color from pink to green to red (Rubellite) to purple to blue-green (Indicolite) to colorless (Achroite) to black. Watermelon tourmaline is both pink and green.
Chrome tourmaline -- vivid green. Derives its color from chromium. Appears red when viewed through a Chelsea filter (emerald filter). Fairly scarce and expensive.
Achroite -- colorless tourmaline. Fairly rare.
Achroite is nearly colorless and rare. Rubellite is pink to red and sometimes has a violet tint. Dravite is yellow brown to dark brown.
 See also: Stone, Color, Tourmaline, Gemstone, Emerald
  
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