Glassy-conchoulat fracture- black fiat m vittrevous slag
Smooth- water-worn , or smooth due to fracture of laminated or fine-gained rock
Granular- Fracture showing more or less uniform rounded grainins-sandstom , oolite
Rough- Rough fracture by fine or medium grained rock containing no easily visible crystalline constituents-basalt , feteite , porphyry , limestone
Cystalline - Containing easily visible crystalline constutuents - Grmite , gabbro , gneiss
Honeycombed - With visible pores and cavities -Brick , pumice , formed slag , clunker , expanded clay
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