Definition
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Etymology
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Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight
From French, from the name of Dolomieu (1750–1801), the French geologist who discovered the rock
Durable Rock, Medium Hardness Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite).
from French néphéline, from Greek nephelē
Fine Grained Rock, Opaque Rock