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Status: Complete
(C) Hall Cases Number | Mineral etc | Composition - Notes etc crystal | Old number etc |
---|---|---|---|
C88 | labradorite (gray) | {in Anorthosite rock Labra. = Ab50An50 to Ab30An 70 gray-greenish, Archean Triclinic, pinacoidal SpG. = 2.7. | none |
| 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, pЄ, 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.) | ? |
C94 | Garnet Schist | with muscovite (sericite), Kyanite and qtz. meta. rock. Mt. Holly complex - Gassetts, Vt. | |
C95. | Pyrite FeS2, 2 specs. | Iron Sulfid, granular, Isometric pyritohedron crystals (some cubes?) | |
C96 |
Magnetite | Fe3O4 fine grained, massive. dike-like - (open-pit) Discordant, Late magm. segreg. type. | --- |
C97 | " 1 spec. | granular, Isom. crystals, Octahedral - with Calcite rhodonite, willemite? pЄ? | --- |
C98 | Gypsum - 2 spec {large smaller | CaSO4*2H2O - Monoclinic, fish-tail twins, fibrous striated. with Sulfur | ? |
C99 | Tyuyamunite uranium oxide | 2 spec. 1.a slice Ca(UO2)2(VO4)2nH2O greenish yellow flouresces - yellow green - Silicified Log. | --- |
C100 | Uranite UO2 "Pitchblende" | in bedded SS - near base of Chinle ([TR?]) resting on Moenkopi (lower Triassic) mudstone | --- |
C101 | Chromite Fe(Cr, Fe)2 O4. | Colraine? old mines S. of Thetford + Asbestos, Que in Gabbroic-simatic instrusive? - | 2 Specs |
C102 + | Sphalerite in quartz | ZnS isometric - octa-tetra-and dodecahedral (dodecahedral cleavage) | 691 |
C103 | Sphalerite, dolomite, pyrite marcasite? | and galena, ZnS. geode. replacement type same [cl?] as in C102 along - layers - also cavity filling | C3 C=Catalina |
C104 | Calena, Isom. 9 specs | PbS isom. cubic - 3 pl of cl. prepend. (90°) | 55 |
C104a | Galena, " cubic | PbS with calcite (hex. rhombic) | 55 |
C104b | Galena, 150m. cubic | " with calcite and pyrite -(striated pyritohedrons | --- |
C105 | Galena, " cubes + octahedrons | PbS. + pyrite sphalprite and dolomite | SC. # 1854 |
C106 | Galena PbS. | with calcite, plus fibrous - sheath-like Barite? or celestite or Anglesite - cubes - octahedrons of PbS. | 690 |
C107 | Galena with Cv and Ag + Zn minerals | PbS - 9% ore, Sphalerite (2nS), 4% chalcopyrite CuFeS2 3% - 5 oz of Ag. | S. C. 2039 |
Notes and Questions
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Suggestions for some of the "?s" above
Case 89, the L in the brackets may be a < leaving <= 86°3"
Case 90, the pf? in brackets looks like the shorthand for pre-Cambrian (small case p, large case C with a line through the middle) This repeats again in case 90 after Archean (which is appropriate)
this link might be useful
https://ngmdb.usgs.gov/fgdc_gds/geolsymstd/fgdc-geolsym-sec32.pdf