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diabase |
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diabase: see basalt basalt (bəsôlt`, băs`ôlt) ..... Click the link for more information. . diabaseor doleriteFine- to medium-grained, dark gray to black intrusive igneous rock. Diabase is one of the dark rocks known commercially as “black granite.” It is extremely hard and tough and is commonly quarried for crushed stone, under the name “trap.” Chemically and mineralogically, diabase closely resembles the volcanic rock basalt, but it is generally somewhat coarser grained. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Coeval activity of this age is represented globally by the Central Scandinavian Dolerite Complex (sills) of the Baltic Shield. Folk-geology was similarly attuned to reading the landscape for water, prospecting dry river beds for graafwater (spade water) trapped by seekoei gatte (hippopotamus holes) and dolerite dykes and everywhere else seeking out the dolerite water klip (water stone), keerbanke or keerdamme (weirs) indicating and caching underground water. Bedrock float includes altered metasediments displaying fresh, disseminated pyrite and coarse grained dolerite. |
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dolerite
