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Roches sédimentaires
Rock specimens are useful for studying textures, grain sizes, and other features altered by pressure, temperature, and other natural forces. Different select categories of rock specimens are available for purchase as well, including metamorphic, igneous, and sedimentary rocks. Sets of rock specimens are housed in compartmentalized collection boxes, with descriptions of each specimen printed for easy confirmation of identification. These rock specimens are carefully selected to be the highest quality to provide students with a suitable introduction to earth materials and their characteristics.
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Ward's® Limestone (Gray)
Fine, common limestone; massive, and will fizzle with HCl.
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Ward's® Sandstone (Banded)
Red, medium, to coarse-grained iron oxide cement; shows hematite bands.
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Ward's® Coal (Lignite)
Brownish black, intermediate stage between peat and bituminous coal.
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Ward's® Arkose
Red-brown to gray, coarse-grained, containing feldspar and mica.
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Shale (Carbonaceous)
Black, fissile; commonly with carbonized fossil plant impressions.
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Limestone (Coquina)
Buff-colored, coarse, detrital limestone, with cemented shell fragments.
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Ward's® Limestone (Shell)
Buff, coarse, crystalline “Austin Marble” with shell casts and molds.
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Ward's® Limestone (Oolitic)
Gray to buff, with numerous ooliths and fossil fragments.