| GRD01X6S0 |
Augen Gneiss
|
Medium-sized sample of gneiss composed of potassium feldspar-quartz-chlorite-muscovite. Well-foliated. Large white potassium feldspar augen. |
Alpine |
1 |
Ritter 154, 14 B |
| GRD01XDS0 |
Non-layered Gneiss
|
Foliated with discontinuous banding. Green amphibole. A single very large augen/boudin compsed of pink quartz with flecks of amphibole and actinolite. Original description: metamorphosed conglomerate. |
Canada |
1 |
Ritter 154, 14 B |
| GRD01XES0 |
Layered Gneiss
|
Biotite/amphibole-quartz-plagioclase (minor)-pyrite (rare). Layer of amphibole/actinolite(?). Large augen/boudin compsed of clear quartz. Original description: metamorphosed conglomerate. |
Canada |
1 |
Ritter 154, 14 B |
| GRD01XLS0 |
Augen Gneiss
|
Large sample of gneiss composed of biotite-potassium feldspar-quartz. Potassium feldspar augen. Discontinuous banding. |
|
1 |
Ritter 154, 24 A |
| GRD01XNS0 |
Augen Gneiss
|
Small slab of gneiss composed of quartz-muscovite-potassium feldspar; Foliated/banding. Potassium feldspar augen. |
Alpine |
1 |
Ritter 154, 14 B |
| GRD01XUS0 |
Augen Gneiss
|
Biotite-quartz-potassium feldspar- oxides (trace)- amphibole (trace). Medium-grained. Slight banding with augen. |
California |
0 |
Ritter 154, 24 B |
| 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 |
| 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 |
| 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 |
| GRD020LS0 |
Layered Gneiss
|
Fine-grained (cryptocrystalline) gneiss with folds and augen. Quartz-pyroxene-pyrite (rare). Foliated with continuous thin bands- relict bedding/laminations (?). |
|
1 |
Ritter 154, 14 B |
| GRD020TS0 |
Augen Gneiss
|
Large sample of a gneiss composed of biotite- potassium feldspar- quartz- pyrite (rare). Potassium feldspar augen and no banding. The largest augen has a bleb of pyrite inside. Original description: Augen gneiss. Microcline porphyroblasts replacing metagreywacke. Qtz-biotite-garnet-microcline. Granulite facies. |
New York |
0 |
Ritter 154, 24 A |
| GRD020US0 |
Non-layered Gneiss
|
Medium-sized slab of fine-grained gneiss composed of quartz-biotite-garnet. Some relict grains. No banding. Original description: metagreywacke; waltons QBG; Qtz-biotite-garnet. |
|
0 |
Camp Elliott |
| GRD020VS0 |
Augen Gneiss
|
Medium-sized sample of coarse-grained gneiss composed of potassium-feldspar-quartz-magnetite-biotite-garnet. Large potassium feldspar augen. One side of the sample is heavily weathered. |
|
0 |
Ritter 154, 24 A |
| GRD0218S0 |
Non-layered Gneiss
|
Small sample of coarse-grained gneiss composed of potassium feldspar-quartz-muscovite. Discontinuous/lumpy banding (former augens?). |
Alpine |
1 |
Ritter 154, 24 A |
| GRD021BS0 |
Migmatitic Gneiss
|
Very large polished slab. Original description: quartz-biotite-muscovite, Tephorite, Spessortite = lamprophyre, epidote veins. |
BK, NC |
0 |
Ritter 154, 14 R |
| GRD021CS0 |
Layered Gneiss
|
Slab of a gneiss with thin continuous bands. Phologopite- quartz-plagioclase (?). |
|
0 |
Ritter 154, 14 A |
| GRD021DS0 |
Augen Gneiss
|
Medium-sized sample of augen gneiss composed of potassium feldspar-quartz-biotite-amphibole. Sample has discontinuous banding and poorly developed augen. Melanocratic bands: biotite and amphibole; Leucocratic bands: Potassium feldspar and quartz. No rose quartz. Original description: Gneiss with rose quartz augen. |
California |
0 |
Ritter 154, 24 A |
| GRD021ES0 |
Layered Gneiss
|
Plagioclase-quartz-amphibole-biotite-garnet-pyrite (trace). Gradation from schist to gneiss. Gneiss has a slight augen texture. Pyrite and garnets are in leucocratic bands. See also M-111. |
California |
0 |
Ritter 154, 24 B |
| GRD021GS0 |
Layered Gneiss
|
Medium-sized sample of fine to medium-grained gneiss composed of biotite-quartz-plagioclase. Thick bands of biotite and amphibole with thin continuous and discontinuous bands of quartz and plagioclase (minor). Some green mineral (vesuvianite?) in the leucocratic layers. |
California |
0 |
Camp Elliott |
| GRD021JS0 |
Augen Gneiss
|
Polished samples of gneiss composed of potassium feldspar-quartz-biotite. Large potassium feldspar augen in melanocratic layer of biotite and quartz. No prominent banding |
|
0 |
Ritter 154, 14 B |
| GRD029ZS0 |
Layered Gneiss
|
Coarse-grained potassium feldspar-quartz-biotite gneiss. Thin continuous and discontinuous bands. |
|
0 |
Ritter 154, 24 A |
| GRD02A5S0 |
Non-layered Gneiss
|
Large sample of muscovite-quartz-chloritoid (?) gneiss. Discontinuous quartz bands. Medium- to coarse-grained. Original description: Mu-Q gneiss. Chlorite zone. |
New Zealand |
0 |
Ritter 154, 14 R |
