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Sabugalite
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A monoclinic mineral, HAl(UO2 )4 (PO4 )4 .16H 2 O ; autunite group; pseudotetragonal; forms crusts of minute yellow platy crystals in pegmatites at Sabugal, Portugal.
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Salamstone
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A pale-red or blue variety of gem corundum in small transparent hexagonal prisms in Sri Lanka.
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Seismometer
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An instrument that detects Earth motions. Syn: seismic detector CF: geophone; hydrophone; seismograph.
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Sheet Mica
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Mica that is relatively flat and sufficiently free from structural defects to enable it to be punched or stamped into specified shapes for use by the electronic and electrical industries. Sheet mica is classified further as block, film, and splittings.
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Sedimentology
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The scientific study of sedimentary rocks and of the processes by which they were formed; the description, classification, origin, and interpretation of sediments.
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Sedimentary Petrology
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The study of the composition, characteristics, and origin of sediments and sedimentary rocks.
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Sabalite
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Trade name for banded variscite; may be banded vashegyite and natrolite; used as a gem stone. Syn: Trainite
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S Wave
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A body wave that causes the rocks along which it passes to move up and down perpendicular to the direction of its own movement.
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Sandstone Dike
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A clastic dike composed of sandstone or lithified sand; a lithified sand dike.
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Salamon-Munro Formula
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A coal pillar design formula that predicts the strength of coal pillars based on a survey of failed and standing coal pillars in South Africa. The coal pillar strength is predicted from coal pillar height and width specifications combined with empirical constants developed from fitting the design equation to 125 case studies.
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