A term used to describe affine grained criss-crossed formation of flow lines on rocks
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Category: <span>T</span>
A complex, piezoelectric trigonal mineral occurring in numerous colours and chemical structures, frequently used as a gemstone
A map indicating elevation and structure through the use of legends and contour lines
An orthorhombic, vitreous mineral frequently used as a gemstone, Al2(F,OH)2SiO4
A specific right assigned to a specific person for a certain, defined area recorded by its governing body
A light porous, pyroclastic rock
A volcanic sedimentary deposits of calcium carbonate
A standard of measurement commonly used for mercantile minerals
A weight equal to 373.2509 grams
A weight equal to 31.1034768 grams