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https://www.starcojewellers.com.au/a-jewelry/an-iron-ore-sometimes-used-in-jewelry.html
* Ore (Jewelry) - Definition - Online Encyclopedia. https://en.mimi.hu/jewelry/ore.html. Hematite (sometimes spelled haematite, and also known as kidney ore) is a lustrous, opaque, blue-black to silvery gray mineral often used in jewelry. Hematite is iron oxide (Fe2O3). Hematite has a hardness of 6.5 and a specific gravity of 4.95 to 5.16.
https://www.rocksandminerals4u.com/support-files/common-minerals-cw.pdf
7 an iron ore, sometimes used in jewelry 8 sometimes called fool's gold 9 sulfide mineral, long metallic slender bladed crystals 11 a very heavy sulfate mineral 12 rock salt 13 calcium fluoride 14 a bright green copper carbonate DOWN 1 a naturally magnetic rock 2 a bright blue copper carbonate 3 metamorphic quartz sandstone
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