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Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
From Greek anthrakites, from anthrax, anthrak meaning coal
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Latite is an igneous, volcanic rock, with aphanitic-aphyric to aphyric-porphyritic texture
From the Latin word latium
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock