| GRD0202S0 |
Calcsilicate (Skarn)
|
Medium- to coarse-grained. Weakly foliated/banded with bands of white wollastonite (?), red garnet porphyroblasts, and green vesuvianite (?). Contact metamorphism. See also M-170. Original description: Ga-Wo skarn. |
California |
0 |
Ritter 154, 14 K |
| 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 |
| GRD0208S0 |
Conglomerate
|
Rounded to subrounded grey quartzite pebbles(~ 3 cm in diameter) in greenish fine-grained matrix composed of abundant pyrite and quartz. Matrix-supported. |
|
1 |
Ritter 154, 23 D |
| GRD0209S0 |
Mafic
|
Hornfels, metavolcanics; large dark sample. Original description: hornfels from Santiago Peak metavolcanics, takenon 11/15/1986 ES101 Field Trip, Stop #3; note epidote veins. |
California |
0 |
Ritter 154, 24 M |
| GRD020AS0 |
Calcsilicate (Skarn)
|
Medium- to coarse-grained. Weakly foliated/banded with bands of white wollastonite (?), red garnet porphyroblasts, and green vesuvianite (?). Contact metamorphism. See also M-149. |
California |
0 |
Ritter 154, 14 K |
| GRD020BS0 |
Calcsilicate (Skarn)
|
Coarse-grained white calcsilicate with gradual development of serpentine and pyrite. Original description: serpentinous marble. Grenville age. |
New York |
1 |
Ritter 154, 14 K |
| 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 |
| GRD020DS0 |
Lineation
|
Original description: sheared Pre-Cambrian granite in shear zone of Adirondacks; N40E, 20, E-W 30 ? |
New York |
1 |
Ritter 154, 14 P |
| GRD020ES0 |
Volcaniclastic Sediment
|
Small (~4 cm) cut sample. Black (Mn?) nodules surrounded by palagonite rims in a coarse-grained matrix of green shards (altered olivine?). Possibly shell casts? Original label: 14 November, 1980. |
Pacific Ocean |
2 |
Ritter 154, 37 A |
| GRD020FS0 |
Mudstone
|
Large (6 x 6 cm), fine-grained, finely-laminated sample. Brown interior with tan exterior/rim. Abundant radiolarians visible in sample. Billet pieces. Original label: 14 November, 1980. |
Pacific Ocean |
1 |
Ritter 154, 37 A |
| GRD020GS0 |
Organic
|
Small fragments of driftwood. Original label: 14 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 A |
| GRD020HS0 |
Breccia
|
Small (~3 cm in diameter), uncut sample; Mn-coated; medium to large angular clasts. Original label: 14 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 A |
| 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 |
| GRD020KS0 |
Crenulation Cleavage
|
Quartz-plagioclase-muscovite-biotite gneiss with folds (crenulation cleavage) with slight lineations. Well-developed foliation and thin continuous bands. |
California |
1 |
Ritter 154, 24 I |
| 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 |
| GRD020MS0 |
Quartzite
|
Dark grey quartzite with some Fe-oxide stains along fractures. Somewhat sugary appearance. |
|
0 |
Ritter 154, 24 F |
| GRD020NS0 |
Serpentinite
|
Green serpentinized rock; Small, rounded light green clasts (relict olivine?) and a few thin black minerals (magnetite?) in a dark green matrix. Original description: verde antique |
Mexico |
0 |
Ritter 154, 3 G |
| GRD020OS0 |
Serpentinite
|
Two small cut samples. Both are sheared. The slightly larger sample has dark green clasts in a light green matrix. Abundant serpentine on the surface. The smaller sample has dark blue clasts in a light grey matrix. The sample has muscovite on the surface. Billet. Original description: sheared serpentine rock. |
Mexico |
1 |
Ritter 154, 14 M |
| GRD020PS0 |
Serpentinite
|
Small dark green serpentinite sample. Vitreous luster. |
|
0 |
Ritter 154, 24 G |
| GRD020QS0 |
Serpentinite
|
Large sample mainly composed of serpentine and clay minerals. There is an obvious distinction between the core of the sample and the rim. The core is very fine-grained light green with thin blue veins. The rim is composed of vitreous light to dark green serpentine with a soapy/greasy feel. Serpentized, altered ultramafic rock. |
|
0 |
Ritter 154, 14 M |
| GRD020RS0 |
Calcsilicate (Skarn)
|
Contact/gradation between metapelite (fine-grained, quartz and phyllosilicates) and medium-grained skarn (poorly formed/preserved amphibole and garnet in granular/sugary quartzite matrix). |
South Dakota |
0 |
Ritter 154, 14 K |
| GRD020SS0 |
Sedimentary Ore Deposits
|
Non-foliated. Moderately granoblastic. Medium- to coarse-grained. Fe-oxide (magnetite), quartz, feldspar, garnet (almandine). Original description: Gneissic, meta-limestone (Fe-SS), granulite facies; Qtz-bio-almandine-magnetite. |
New York |
0 |
Ritter 154, 14 Q |
| 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 |
