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Cleavage tutorial Optical mineralogy
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A series of videos illustrating cleavages in a range of minerals. Supported by Boise State University and the US National Science Foundation.
00:00 Clintonite, showing numerous regularly oriented cleavage lines
00:30 Gedrite with 60-120° cleavage
00:50 Clinopyroxene with approximately 90-90° cleavage
01:06 Feldspars in poorly made sections can show 2 good cleavages
01:36 Kyanite has one good cleavage and a parting. Also muscovite in this
02:07 Biotite has one good cleavage
02:37 Muscovite and chlorite each have one good cleavage, but faint here
03:07 Wollastonite shows one good cleavage and inclined extinction
03:37 Apatite has cross-fractures, but no cleavage
03:51 Garnet has no cleavage, but can fracture
00:00 Clintonite, showing numerous regularly oriented cleavage lines
00:30 Gedrite with 60-120° cleavage
00:50 Clinopyroxene with approximately 90-90° cleavage
01:06 Feldspars in poorly made sections can show 2 good cleavages
01:36 Kyanite has one good cleavage and a parting. Also muscovite in this
02:07 Biotite has one good cleavage
02:37 Muscovite and chlorite each have one good cleavage, but faint here
03:07 Wollastonite shows one good cleavage and inclined extinction
03:37 Apatite has cross-fractures, but no cleavage
03:51 Garnet has no cleavage, but can fracture
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