Geography, 30.12.2019 23:31 wfergphilly3159
An extraordinarily beautiful purple - blue gemstone (typically found in only one country in africa), with a hardness close to or less than 7.0 that is often formed by heat treatment of a brownish or greyish silicate mineral is a gem variety of
1) zoisite
2) cordierite
3) thulite
4) tourmaline
5) feldspar
Answers: 2
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Alow pressure system is formed when an air mass cools over a cool surface and sinks. true or false
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An extraordinarily beautiful purple - blue gemstone (typically found in only one country in africa),...
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