| GRD01XFS0 |
Phyllite
|
Fine-grained blue/grey minerals (chlorotoid?) in cream-colored fine-grained phyllosilicate (muscovite?) matrix. Slight slaty cleavage and dull sheen. Original description: Chlorotoid schist. |
Camlia |
0 |
Ritter 154, 14 E |
| GRD01XHS0 |
Ga-bearing Schist
|
Medium-sized sample of tremolite-plagioclase-muscovite-garnet schist. Well-foliated. See also M-36. |
|
1 |
Ritter 154, 14 G |
| GRD01XIS0 |
Ga-bearing Schist
|
Small sample of tremolite-quartz-muscovite-garnet schist. Well-foliated. See also M-35. Missing 1/2 thin sections |
|
2 |
Ritter 154, 3 G |
| GRD01XJS0 |
Ga-bearing Schist
|
Medium-sized sample of biotite-quartz-amphibole-garnet schist. Weakly-foliated. Porphyroblast-rich schist? |
|
1 |
Ritter 154, 14 D |
| GRD01XKS0 |
Schist
|
Small sample of amphibole-purple tremolite (?) schist. Poorly foliated and generally coarse-grained. Original description: fuchsite-bearing quartz-mica schist. |
Utah |
1 |
Ritter 154, 14 D |
| GRD01XLS0 |
Augen Gneiss
|
Large sample of gneiss composed of biotite-potassium feldspar-quartz. Potassium feldspar augen. Discontinuous banding. |
|
1 |
Ritter 154, 24 A |
| GRD01XMS0 |
Amphibole Schist
|
Small slab of amphibole-plagioclase-chlorite (trace) schist. Well-foliated with lineations. Portion of a cobble? |
Alpine |
1 |
Ritter 154, 24 C |
| GRD01XNS0 |
Augen Gneiss
|
Small slab of gneiss composed of quartz-muscovite-potassium feldspar; Foliated/banding. Potassium feldspar augen. |
Alpine |
1 |
Ritter 154, 14 B |
| GRD01XOS0 |
Schist
|
Small sample of garnet-quartz-potassium feldspar-biotite schist. |
Alpine |
1 |
Ritter 154, 14 D |
| GRD01XQS0 |
Schist
|
Medium-sized quartz-biotite-plagioclase-muscovite schist. Some banding and yellow sulfur mineralization. Original description: hornblende schist; Jurassic-Cretaceous. |
California |
1 |
Ritter 154, 24 C |
| GRD01XRS0 |
Amphibole Schist
|
Small sample of amphibole-quartz-muscovite-glaucophane(?) schist. Original description: glaucophane schist. Jurassic? |
Mexico |
1 |
Ritter 154, 24 C |
| GRD01XUS0 |
Augen Gneiss
|
Biotite-quartz-potassium feldspar- oxides (trace)- amphibole (trace). Medium-grained. Slight banding with augen. |
California |
0 |
Ritter 154, 24 B |
| GRD01XVS0 |
Schist
|
Medium-sized sample of quartz-talc-biotite-muscovite schist. Well-foliated. Large quartz augen (relict pebble?) |
Alps |
1 |
Ritter 154, 14 D |
| GRD01XWS0 |
Augen Gneiss
|
Chlorite-quartz-pyrite (trace) gneiss. Augen/stringers of quartz. Medium-grained. Original description: amphibolite (?). |
Alps |
0 |
Ritter 154, 14 B |
| GRD01XZS0 |
Migmatitic Gneiss
|
Large well-foliated sample displaying alternating schistose and gneissic layers with boudins. The dark schistose layers are mainly composed of biotite and quartz. The boudins are mainly quartz, potassium feldspar, plagioclase, and biotite. Grading to migmatite. |
|
0 |
Ritter 154, 14 B |
| GRD01Y2S0 |
Non-layered Gneiss
|
Medium-sized sample of gneiss composed of quartz-potassium feldspar-biotite-garnet (trace). Poorly developed lineations. Original description: Granulite facies (?), Qtz- K-spar- Garnet- Biotite. |
New York |
0 |
Ritter 154, 24 A |
| GRD01Y3S0 |
Schist
|
Large sample of biotite-quartz schist. Very well foliated/lineated. Fine-grained. |
Canada |
0 |
Ritter 154, 14 I |
| GRD01YSS0 |
Amphibole Schist
|
Spotted garnet amphibole schist. Amphibole-quartz-chalcopyrite-euhedral porphyroblasts of garnet. The garnet is mostly in a band. |
|
0 |
Ritter 154, 14 G |
| GRD01ZQS0 |
Layered Gneiss
|
Potassium feldspar-quartz-garnet-amphibole (?). Coarse to very coarse-grained. Not the nicest example of a gneiss. |
California |
0 |
Camp Elliott |
| GRD01ZUS0 |
Non-layered Gneiss
|
Medium-sized sample of a gneiss composed of quartz-muscovite-plagioclase-pyrite (trace). Little to no banding present. |
|
1 |
Ritter 154, 24 B |
| GRD0201S0 |
Non-layered Gneiss
|
Slightly foliated and banded; Leucocratic layer is composed of potassium feldspar-quartz-amphibole. Melanocratic layer is composed of phologopite-biotite-amphibole. |
|
0 |
Ritter 154, 24 A |
| GRD0203S0 |
Non-layered Gneiss
|
Quartz-plagioclase-pyrite gneiss. Weakly to moderately foliated (discontinuous banding). Coarse- to very coarse-grained. From near an ore deposit (?). Not a nice example of a gneiss. |
|
0 |
Ritter 154, 24 B |
| GRD0204S0 |
Migmatitic Gneiss
|
Large sample of biotite-potassium feldspar-garnet-quartz. Coarse-grained and well-foliated (large continuous bands/augens of kspar). Original description: PreC migmatite. |
New York |
1 |
Ritter 154, 14 I |
| GRD0205 |
Schist
|
Medium-sized sample of Pyrophyllite-magnetite-quartz-muscovite (trace). Well-foliated (~radiating lamellae), coarse- to very coarse-grained (blades) of pyrophyllite. Amphibole (or staurolite?) porphyroblasts. |
|
0 |
Ritter 154, 23 C |
| GRD0205S0 |
Schist
|
Medium-sized sample of Pyrophyllite-magnetite-quartz-muscovite (trace). Well-foliated (~radiating lamellae), coarse- to very coarse-grained (blades) of pyrophyllite. Amphibole (or staurolite?) porphyroblasts. |
|
1 |
Ritter 154, 14 D |
| GRD0206S0 |
Non-layered Gneiss
|
Large sample of a well-foliated, medium- to coarse-grained gneiss. The sample contains a large band of scapolite, biotite, quartz, potassium feldspar, and pyroxene. The band is between biotite-rich layers with less scapolite. Possibly part of a migmatite. |
Canada |
1 |
Ritter 154, 14 A |
| GRD0207S0 |
Layered Gneiss
|
Small sample of a gneiss composed of quartz-plagioclase-biotite-magnetite-garnet. The sample has continuous banding, quartz and garnet porphyroblasts, and is fine- to medium-grained. |
|
0 |
Ritter 154, 24 A |
| GRD020CS0 |
Non-layered Gneiss
|
Potassium feldspar-quartz-magnetite. Large feldspar augen (some with laboradorescence) and thin wispy layers of magnetite. Mica-poor gneiss (?) |
|
1 |
Ritter 154, 24 B |
| GRD020IS0 |
Amphibole Schist
|
Multiple small samples of amphibolite. Generally amphibole-potassium feldspar-quartz-pyrite- epidote (rare). Mineral assemblage depends on individual sample. |
New York |
0 |
Ritter 154, 14 G |
| GRD020JS0 |
Amphibole Schist
|
Amphibole-garnet-mica schist. Abundant garnets (many are approximately 4 mm in diameter) in amphibole matrix. Sample is capped by thin layer of fine-grained phyllosilicates (phyllite?). The contact between phyllite and amphibolite is Fe-stained. |
|
0 |
Ritter 154, 3 G |
