Untitled Page 14

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smsherman at Jan 24, 2021 04:30 PM

Untitled Page 14


(C) Hall Cases Number Mineral etc Composition - Notes etc crystal Old number etc
C88 labradorite (gray) {in Anorthosite rock Labra. = Ab30An70 Triclinic, pinacoidal SpG. = 2.7. gray-greenish, Archean none
C90 89. Albite twinning striations plagio. felds. on basal 001 face 2 planes, perfect - basal (001) + brachypinacoidal (101)? - [L?] = 86°3"
C90 Garnet (top of case (1.good crystal - 1') and 2nd (poorer crystal) almost 1' in diam. Isom. dodecahedrons, [pf?], Archean? Grenville. dodecahedral parting student coll 2003
C91 Garnet dodecahedrons (on top of case) in light colored syenitic? gneiss none
C91 Garnet " in gabbroic - gneiss, Archean [pf?] - Almandite and pyrope var etc none
C93 " " mostly Almandite? var. (H=75-8.) sy Mpt. schistose large Amphibole - black monoclinic - crystals + chlorite? ?
C94 Garnet Schist with muscovite (sericite), Kyanite and qtz. meta. rock. Mt. Holly complex - Gassetts, Vt.
C95. Pyrite FeS2

Untitled Page 14


(C) Hall Cases Number Mineral etc Composition - Notes etc crystal Old number etc
C88 labradorite (gray) {in Anorthosite rock Labra. = Ab30An70 Triclinic, pinacoidal SpG. = 2.7. gray-greenish, Archean none
C90 89. Albite twinning striations plagio. felds. on basal 001 face 2 planes, perfect - basal (001) + brachypinacoidal (101)? - [L?] = 86°3"