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United States Bureau of Mines
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 ...
Hollow or imperfectly developed crystals formed by rapid crystallization.
Industry:Mining
Hollow, bubblelike, or roselike spherulites, usually with a concentric structure, that occur in rhyolite, obsidian, and related rocks. Sing: lithophysa.
Industry:Mining
Hollow, roughly rectangular pebble lined with goethite; Lenham beds, Netley Heath, Surrey, U.K.
Industry:Mining
Hooks used in lifting blocks of stone. They are used in pairs connected with a chain, and are so constructed that the tension of the chain causes them to adhere firmly to the rock.
Industry:Mining
Horizons in coalbeds resulting from temporary halting of the accumulation of vegetal material. They are frequently marked by a bed of clay or sand.
Industry:Mining
Horizontal angle between adjacent sides of a polygon, measured within the polygon.
Industry:Mining
Horizontal angle measured clockwise from the preceding line to the following one.
Industry:Mining
Horizontal boards placed to mark a line and a grade of a proposed building or slope.
Industry:Mining
Horizontal distance from the center of rotation of a crane to its hoisting hook.
Industry:Mining
Horizontally mounted cylinder rotating between trunnions through which gas or oil flame is introduced.
Industry:Mining