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Reference.org
Huntite
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<p>Huntite is a <a href="/facts/Carbonate_mineral/8DUmuAhp">carbonate mineral</a> with the chemical formula Mg3Ca(CO3)4. Huntite crystallizes in the <a href="/facts/Trigonal/sSSok8wo">trigonal</a> system and typically occurs as platy crystals and powdery masses. For most of recorded history its main use was as a white pigment. Today the most common industrial use of huntite is as a natural mixture with <a href="/facts/Hydromagnesite/GKeQwlrr">hydromagnesite</a> as a <a href="/facts/Flame_retardant/0dpdUCYh">flame retardant</a> or <a href="/facts/Fire_retardant/RkwChTJu">fire retardant</a> additive for polymers. </p>