| GRD01YLS0 |
Calcite Marble
|
Fine-grained marble cut by veinlets. Impure limestone protolith (?). |
Arizona |
1 |
Ritter 154, 14 J |
| GRD01YMS0 |
Impure Marble
|
Small sample of a coarse-grained marble. Nice cleavage faces on calcite and muscovite. Books of muscovite and small metallic flecks (trace). See also M-58 and M-59. |
|
0 |
Ritter 154, 14 J |
| GRD01YNS0 |
Impure Marble
|
Calcite-phlogopite-muscovite-plagioclase-quartz marble. Generally coarse-grained. Poorly foliated with granoblastic texture. |
Alpine |
5 |
Ritter 154, 3 H |
| GRD01YOS0 |
Impure Marble
|
Fine-grained grey and white marble. Relict bedding or structure? Large, euhedral oxidized pyrite porphyroblasts. Original description: dolomite marble, contains sulfides. |
|
0 |
Ritter 154, 14 J |
| GRD01YPS0 |
Eclogite
|
Small sample; Red pyrope porphyrobasts in green omphasite-chlorite matrix; minor amount of muscovite (associated with the garnets); Franciscan. Original description: Retrograde chlorite eclogite. |
California |
0 |
Ritter 154, 14 N |
| GRD01YQS0 |
Eclogite
|
Small red pyrope porphyrobasts in fine-grained green omphasite-chlorite matrix. Original description: Eclogite. Omphasite-a green pyroxene, Pyrope Almadine, a red garnet. Highest P+T faces. |
California |
0 |
Ritter 154, 14 N |
| GRD01YRS0 |
Eclogite
|
Two slabs and a block of eclogite. Small red garnet porphyrobasts in green omphasite-chlorite matrix. Medium-grained. |
|
1 |
Ritter 154, 14 N |
| 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 |
| GRD01YTS0 |
Greenschist
|
Chlorite-cordierite-epidote, sphene-magnetite-quartz-biotite schist. Chlorite schist with magnetite porphyroblasts and uniaxial positive first order grey porphyroblasts (cordierite?). |
New Zealand |
5 |
Ritter 154, 3 H |
| GRD01YUS0 |
Relict Textures
|
Well-foliated. Stretched quartzite pebbles (~3 in length). Chlorite-biotite-muscovite schist between pebbles. |
California |
0 |
Ritter 154, 14 O |
| GRD01ZQS0 |
Layered Gneiss
|
Potassium feldspar-quartz-garnet-amphibole (?). Coarse to very coarse-grained. Not the nicest example of a gneiss. |
California |
0 |
Camp Elliott |
| GRD01ZRS0 |
Crenulation Cleavage
|
Anthophyllite (tremolite) schist. Well-foliated with crenulation cleavage. |
New York |
0 |
Ritter 154, 24 I |
| 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 |
| GRD01ZVS0 |
Quartzite
|
Pink, medium-grained quartzite with red lenses of Fe-oxide mineralization (likely along fractures). Billet. |
|
0 |
Ritter 154, 14 L |
| GRD01ZWS0 |
Quartzite
|
Fine- to medium-grained white quartzite with some molybdenite along a fracture/surface. Original description: molybdenite-bearing quartzite. |
|
0 |
Ritter 154, 14 L |
| 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 |
| 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 |
| 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 |
| 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 |
