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2. Tanzanite - Wikipedia

   en.wikipedia.org/wiki/Tanzanite

   TanzaniteOne, a major commercial player in the tanzanite market, through its non-profit subsidiary, the Tanzanite Foundation, [27] has introduced its own color-grading system. [28] The new system's colour-grading scales divide tanzanite colors into a range of hues, between bluish-violet, indigo and violetish-blue.

3. Pleochroism - Wikipedia

   en.wikipedia.org/wiki/Pleochroism

   Pleochroism is an extremely useful tool in mineralogy and gemology for mineral and gem identification, since the number of colors visible from different angles can identify the possible crystalline structure of a gemstone or mineral and therefore help to classify it. Minerals that are otherwise very similar often have very different pleochroic ...

4. Zoisite - Wikipedia

   en.wikipedia.org/wiki/Zoisite

   Zoisite may be blue to violet, green, brown, pink, yellow, gray, or colorless. Blue crystals are known under the name tanzanite. It has a vitreous luster and a conchoidal to uneven fracture. When euhedral, zoisite crystals are striated parallel to the principal axis (c-axis). Also parallel to the principal axis is one direction of perfect cleavage.

5. Talk:Pleochroism - Wikipedia

   en.wikipedia.org/wiki/Talk:Pleochroism

   A question for pleochroism in hand sample: If a mineral is pleochroic in thin section under PPL, will it neccesarily exhibit the same pleochroism under hand sample and non-polarized light? Boz3030 ( talk ) 07:55, 23 December 2007 (UTC) P.S: As to how it is measured or described: It is somewhat subjective in that it would be described as weak ...

6. Rhodolite - Wikipedia

   en.wikipedia.org/wiki/Rhodolite

   The colors from different rhodolite sources may vary from a lavender pink to raspberry rose or raspberry red and from purplish-violet (grape) to purplish red. [ 5 ] The color of rhodolites, combined with their brilliance, durability, and the accessibility of stones with no visible inclusions have brought about some demand for the stone in the ...

7. Ford CEO: Trump tariffs would wipe out billions in profits if ...

   www.aol.com/ford-ceo-trump-tariffs-wipe...

   Ford CEO Jim Farley has a message to the Trump administration: Our profits will be run over if you hit the world with tariff hikes."There's no question that tariffs at 25% level from Canada ...