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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. |
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Mapping in this area also outlined a swarm of diabase dykes and associated diatreme breccias, which were emplaced in the main E-W rift associated with the Richmond Gulf zone (Simard et al. Outcroppings of diabase boulders are found throughout the park. The company's geologist has confirmed that the site contains more than 100 million tons of diabase in a relatively pure deposit, an estimate confirmed by geologists from the Ministry of Natural Resources and the Finnish firm which has agreed to purchase the material. |
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diabase
