| GRD01VES0 |
Slate
|
Fine grained purple slate with leach spots. Poorly developed slaty cleavage. Original description: Argillite, Crystal Spring formation. |
California |
0 |
Ritter 154, 14 F |
| GRD01VFS0 |
Slate
|
Multiple pieces of purple slate with green mottling. Very small pyrite and garnet crystals which are visible with hand lense. Perfect slaty cleavage. |
|
0 |
Ritter 154, 14 F |
| GRD01VGS0 |
Slate
|
Dark grey-brown with black leaf/reed imprints. Slaty cleavage. Fine-grained. |
|
0 |
Ritter 154, 14 F |
| GRD01VHS0 |
Slate
|
Dark grey slate with black, round crystals (amphibole? Chloritoid? Fe-minerals?). Slaty cleavage. |
Fremont Isle |
0 |
Ritter 154, 14 F |
| GRD01VIS0 |
Non-layered Gneiss
|
Small sample of gneiss composed of biotite-garnet-quartz-potassium feldspar. Poorly developed banding. |
|
0 |
Ritter 154, 24 B |
| GRD01VJS0 |
Augen Gneiss
|
Quartz-potassium feldspar-plagioclase-biotite gneiss. Potassium feldspar augen. Decent banding and nice lineations. |
|
0 |
Ritter 154, 14 B |
| GRD01VLS0 |
Phyllite
|
Well-developed slaty cleavage (sometimes bent/wavy). Mainly composed of fine-grained phyllosilicates with a few pyrite pyrphyroblasts. Multiple small specimens. |
|
0 |
Ritter 154, 14 E |
| GRD01VMS0 |
Slate
|
Green, fine-grained, earthy luster. Original description: phyllite, meta-sandstone or siltstone, muscovite, chlorite? |
|
0 |
Ritter 154, 14 F |
| GRD01VNS0 |
Phyllite
|
Defined slaty cleavage. Fine-grained phyllosilicates and veinlets of quartz. |
|
0 |
Ritter 154, 14 E |
| GRD01VOS0 |
Slate
|
Purple with reddish/orange veins (Fe-staining?). Earthy luster. Very small amphibole crystals (rare). Original description: argillite. |
California |
1 |
Ritter 154, 14 F |
| GRD01VPS0 |
Phyllite
|
Defined slaty cleavage (with crenulations). Composed of fine-grained phyllosilicates. |
|
0 |
Ritter 154, 14 E |
| GRD01VQS0 |
Slate
|
Dark grey/black slate with visible muscovite crystals. |
|
0 |
Ritter 154, 14 F |
| GRD01VRS0 |
Phyllite
|
Dark grey/black sample with well-defined slaty cleavage with crenulations. Fine-grained phyllosilicates with rust-colored vugs where Fe-minerals once were. Medium to large-sized pyrite crystals. Original description: pelitic schist, Walloomsac Formation? |
New York |
0 |
Ritter 154, 14 E |
| GRD01VSS0 |
Phyllite
|
Dark grey sample with slight slaty cleavage. Composed of fine-grained phyllosilicates with amphibole and garnet porphyroblasts. race amounts of muscovite. Original description: Ga metapelite. |
New York |
0 |
Ritter 154, 14 E |
| GRD01VTS0 |
Ga-bearing Schist
|
Slight slaty cleavage. Fine- to medium-grained grey phyllosilicates, garnet porphyroblasts, and trace amounts of muscovite and quartz. |
South Dakota |
0 |
Ritter 154, 24 D |
| GRD01VUS0 |
Ga-bearing Schist
|
Thin slab of schist composed of very fine-grained green phyllosilicates with altered garnet porphyroblasts. Possibly retrograde (altered). Well-developed slaty cleavage. |
|
0 |
Ritter 154, 24 D |
| GRD01VVS0 |
Ga-bearing Schist
|
Small sample of medium-grained phyllosilicates with very small garnet (rare) and lenses/sigma clasts of quartz. Well-developed slaty cleavage. |
|
0 |
Ritter 154, 24 C |
| GRD01VWS0 |
St-bearing Schist
|
Very small sample of a medium- to coarse-grained schist composed of muscovite-garnet-staurolite. Gem-like crystals. |
|
0 |
Ritter 154, 24 C |
| GRD01VXS0 |
Slate
|
Argillite. Purple with pink and teal lenses (due to leaching?). Fine-grained. Earthy luster. |
|
0 |
Ritter 154, 14 F |
| GRD01VYS0 |
St-bearing Schist
|
Medium-sized sample of a schist composed mainly fine-frained phyllosilicates (chlorite, biotite, muscovite trace) with garnet and staurolite porphyroblasts. Nice lineations. |
|
0 |
Ritter 154, 14 C |
| GRD01VZS0 |
St-bearing Schist
|
Small sample of schist composed mostly of muscovite and staurolite. Small s fold in cross-section. |
|
0 |
Ritter 154, 24 C |
| GRD01W0S0 |
Schist
|
Medium-grained phyllosilicates (mostly phlogopite) with a small amount of quartz. Well-developed foliation. Original description: graphitic schist. |
New York |
0 |
Ritter 154, 14 C |
| GRD01W1S0 |
St-bearing Schist
|
Medium-sized sample of schist composed of fine-grained phyllosilicates with garnet and a few staurolite porphyroblasts. See also M-167 for a similar sample. Original description: Staurolite-garnet schist of the staurolite zone of the Flag Rock formation. |
South Dakota |
0 |
Ritter 154, 14 C |
| GRD01W2S0 |
Greenschist
|
Medium-sized sample of talc-actinolite-tremolite schist. Green fibrous/foliated sample with very nice actinolite crystals. |
|
0 |
Ritter 154, 14 C |
| GRD01W3S0 |
Ga-bearing Schist
|
Multiple small samples of mica-garnet-quartz schist. Fine-grained phyllosilicates (muscovite and biotite?) with garnet porphyroblasts and discontinuous quartz lenses. |
|
0 |
Ritter 154, 24 C |
| GRD01W4S0 |
Non-layered Gneiss
|
Black biotite with some continuous and discontinuous banding. Large sample. |
California |
0 |
Ritter 154, 14 I |
| GRD01W4S1 |
Non-layered Gneiss
|
Black biotite with some continuous and discontinuous banding. Small sample. |
California |
0 |
Ritter 154, 24 B |
| GRD01W5S0 |
Ky-bearing Schist
|
Medium sample of kyanite-muscovite-quartz-chlorite schist. Very nice sample. See also M-43 and M-209. |
|
1 |
Ritter 154, 3 G |
| GRD01W6S0 |
Talc Schist
|
Medium-sized sample of talc-dolomite- tremolite schist. Pale-green talc (sheared) with a thick band of dolomite (icelandic spar). Minor amount of dark green tremolite in the talc. |
|
1 |
Ritter 154, 14 G |
| GRD01W7S0 |
Crenulation Cleavage
|
A medium-sized sample of chlorite-quartz-pyrite schist. Quartz stringers that contain cubes of pyrite. Beautiful crenulations. |
California |
2 |
Ritter 154, 14 P |
