| GRD01ZXS0 |
Quartzite
|
Large sample of pink fine- to medium-grained quartzite with white coarse-grained wollastonite inclusion. Occasional black flecks along margin of the inclusion. |
|
0 |
Ritter 154, 24 M |
| GRD01ZYS0 |
Serpentinite
|
Very fine-grained (almost glassy) brown serpentinite. Small sample with cream-colored veinlets. |
|
1 |
Ritter 154, 14 M |
| GRD01ZZS0 |
Impure Marble
|
Marble with relict bedding. The light beds are composed of carbonate. The dark beds are carbonaceous carbonate. Some Fe-staining along fractures. Original description: carbonaceous marble. |
California |
0 |
Ritter 154, 14 J |
| 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 |
| 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 |
| 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 |
| GRD020XS0 |
Blueschist
|
Small sample of glaucophane-calcite schist. Fine-grained dark blue glaucophane and thin calcite veins cross-cut the foliation. Original description: glaucophane rock. |
Mexico |
1 |
Ritter 154, 24 C |
| GRD0210S0 |
Mafic
|
Altered mafic pegmatite. Coarse- to very coarse-grained. Hornblende-quartz. Miarolitic cavities are still present with nicely terminated crystals preserved. Original description: Metamorphosed pegmatite or granophyre of M50. Hbl-qtz-plag. |
New York |
1 |
Ritter 154, 14 H |
| GRD0211S0 |
Serpentinite
|
Small sample of serpentine replacing potassium feldspar. Gradational colors from brown-green-blue-purple-white. Original description: serpentine replacing feldspar. |
New York |
0 |
Ritter 154, 24 G |
| GRD0212S0 |
Serpentinite
|
Massive serpentine-talc rock. Dull dark green with thin white crystalline veins and small crystals of pyrite and large crystals of magnetite. Original label: verd antique. |
Vermont |
1 |
Ritter 154, 3 H |
| GRD0213S0 |
Serpentinite
|
Large sample of magnesite-bearing serpentine. Original label: Glenarm Serpentine; slickensides. |
Maryland |
1 |
Ritter 154, 14 M |
| GRD0215S0 |
Serpentinite
|
Medium-sized sample of serpentinite that has a obvious distinction between the interior and exterior of the sample. The interior is very fine-grained and light green with abundant blue veinlets and magnetite crystals. The rim of the sample is blue while the exterior is light-green and golden serpentine with slickenslides. Antigorite? |
Canada |
0 |
Ritter 154, 24 G |
| GRD0216S0 |
Dolomite Marble
|
White, granoblastic dolomite marble. Faint spots of Fe-staining. Monomineralic. See also M-425. |
|
0 |
Ritter 154, 14 J |
| GRD0216S1 |
Dolomite Marble
|
White, granoblastic dolomite marble. Faint spots of Fe-staining. Monomineralic. See also M-425. |
|
0 |
Ritter 154, 24 E |
| GRD0219S0 |
Eclogite
|
Two small samples with black exteriors. A small cut surface reveals red anhedral garnets in a dark green fine-grained matrix. |
|
0 |
Ritter 154, 14 N |
| GRD021VS0 |
Serpentinite
|
Large, cut sample (~9x8x5 cm from cut face) olive green sample with magnetite lenses. Fe-Mn crust on sample. Billet pieces. Original label: 20 November, 1980. |
Pacific Ocean |
1 |
Ritter 154, 37 B |
| GRD021XS0 |
Serpentinite
|
Medium-sized (~6x4x4.5 cm from the cut face) sample composed of light green and black-dark green spots of serpentine. Abundant magnetite. Billet pieces. Original label: 20 November, 1980. |
Pacific Ocean |
1 |
Ritter 154, 37 B |
| GRD0221S0 |
Serpentinite
|
Large (~8 cm in diameter) uncut dark green sample with a few patches of dull grey magnetite and light green serpentinite. Patchy Fe-Mn crust on sample. Original label: 20 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 B |
| GRD0222S0 |
Serpentinite
|
Small (~3 cm in diameter) uncut blue-green sample with light green serpentine and patches of magnetite on the surface. Original label: 20 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 B |
| GRD0223S0 |
Serpentinite
|
Small (~3 cm in diameter) uncut blue-green sample with light green serpentine, patches of magnetite, and Fe-oxide stains on the surface. Original label: 20 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 B |
| GRD0224S0 |
Serpentinite
|
Large (~8 cm in diameter) uncut sample. Earthy cream-colored surface, but patches in the surface reveal a vitreous light green interior with occasional black crystals (magnetite?). Original label: 20 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 B |
| GRD0225S0 |
Serpentinite
|
Medium-sized (~9x6x4 cm) uncut sample. Earthy cream-colored surface, but patches reveal a vitreous light green interior with occasional black crystals (magnetite?). Original label: 20 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 B |
| GRD0226S0 |
Serpentinite
|
Small (~3 cm in diameter) uncut sample. Dark green-blue core with patchy Fe-Mn crust on sample. Original label: 20 November, 1980. |
Pacific Ocean |
0 |
Ritter 154, 37 B |
