- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
Having crystal forms that, while possessing neither a plane nor a center of symmetry, may occur in two positions that are mirror images of one another. The two positions cannot be converted into each other by any rotation, but are related to each other as are the right and left hand, hence designated right- and left-handed forms. Enantiomorphous crystals cause circular polarization of light, e.g., quartz.
Industry:Mining
Having minor beds or laminae inclined to the main planes of stratification, e.g., crossbedded sandstone.
Industry:Mining
Having physical properties that vary in different directions. Specif. in optical crystallography showing double refraction. Characteristic of all crystalline substances, including minerals, except those belonging in the isometric system, which are isotropic. Opposite of isotropic.
Industry:Mining
Having planes of cleavage inclined to the axis; also, abounding with facets of cleavage.
Industry:Mining
Having sharp angles or borders; specif. said of a sedimentary particle showing very little or no evidence of abrasion.
Industry:Mining
