Legend has it that the Vikings used a na... ...An Iceland spar, which is transparent and made of calcite , was found in the wreck of an Elizabe...
https://www.neatorama.com/2013/03/07/Viking-Sunstone/
Viking Sunstone...
Holding Back the Sahara with a Bacterial Wall...
The Sahara Desert is growing, consequently reducin... ...ous and fanciful plan to use bacteria to create a calcite wall on the desert's southern edge: Bacillus pas... ...und in wetlands, and is able to chemically create calcite . By unleashing the bacteria on areas of the deser...
https://www.neatorama.com/2009/07/28/holding-back-the-sahara-with-a-bacterial-wall/
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