What is pumice on Moh's hardness scale?

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What is pumice on Moh's hardness scale?

2006-11-12 11:15:01 · 2 answers · asked by here_nor_there 4 in Science & Mathematics ➔ Earth Sciences & Geology

2 answers

Robert has this correct. Pumice is essentially volcanic glass with air bubbles, therefore pumice has the same hardness as obsidian, which is 6 - the same as the glass on your window.

Quartz, with the same chemical composition SiO2, is harder (7) because it is crystalline.

2006-11-12 13:29:26 · answer #1 · answered by minefinder 7 · 0⤊ 0⤋

Pumice = 6 on Moh's Scale

2006-11-12 19:51:56 · answer #2 · answered by Robert 2 · 1⤊ 0⤋