a mineral that is a complex silicate especially of calcium magnesium iron and aluminum
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idocrasea mineral that is a complex silicate especially of calcium, magnesium, iron, and aluminum
augitesilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
augitessilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
augiticsilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
talca very soft mineral that is a basic silicate of magnesium, has a soapy feel, and is used especially in making talcum powder
meerschauma fine light white clayey mineral that is a hydrous magnesium silicate found chiefly in Asia Minor and is used especially for tobacco pipes