| GRD029PS0 |
Relict Textures
|
Three small samples of metaconglomerate. Stretched granite/diorite pebbles in schist matrix. Schist is composed of biotite-muscovite-quartz-pyrite Original label: Biotite-muscovite-quartz. Mica Schist Conglomerate. |
|
0 |
Ritter 154, 24 H |
| GRD029QS0 |
Relict Textures
|
Discontinuous relict laminations and cross-bedding in fine-grained quartzite. Original label: Zebra rock. |
Arizona |
0 |
Ritter 154, 14 O |
| GRD029RS0 |
Relict Textures
|
Amphibolite with quartz vein and pyrite-rich layers. Sample is capped by chlorite-biotite schist. Original label: Metagreywake. |
Wyoming |
1 |
Ritter 154, 14 O |
| GRD029SS0 |
Relict Textures
|
Black, fine-grained sample with sheared clasts. Low-grade metamorphism. Original label: Tillite (Metatillite). Coll. No. 69A. |
Vermont |
0 |
Ritter 154, 24 H |
| GRD029TS0 |
Relict Textures
|
Alternating dark green shale and grey fine-grained quartzite layers. Low-grade metamorphism. Original label: Low-grade chert or black shale? |
|
0 |
Ritter 154, 14 O |
| GRD029US0 |
Relict Textures
|
Fine-grained quartz-biotite-potassium feldspar. A large potassium feldspar crystal. Relict grains. Original label: Metagreywacke. Quartz-biotite. |
NW Corner LB Quad |
0 |
Ritter 154, 24 H |
| GRD029VS0 |
Folds
|
Banded, folded, and cut by quartz veinlets. Mainly cryptocrystalline materials (quartz, chlorite?) and relict soft-sediment structures. Banded hornfels? Original label: Serpentized gneiss. |
NW Corner LB Quad |
0 |
Ritter 154, 24 I |
| GRD029WS0 |
Veins
|
Relict sedimentary layers with slight foliation. Several generations of veins: warped veins in pinkish layer, small vertical veins in dark layer, large cross-cutting quartz. |
Alpine |
1 |
Ritter 154, 14 P |
| GRD029XS0 |
Relict Textures
|
Metagreywacke. Fine-grained quartz-biotite-plagioclase. Cryptocrystalline. A few stringers of quartz and plagioclase. Original label: Metagreywacke (Q-Bi-Pl). |
|
0 |
Ritter 154, 24 I |
| GRD029YS0 |
Folds
|
Very well-foliated (laminated), fine-grained schist. Quartz-riebeckite-amphibole-chlorite(?) schist. Nice differential slip microstructure. Original label: metasomatized serpentine schist. |
|
1 |
Ritter 154, 24 I |
| GRD02A0S0 |
Relict Textures
|
Metamorphosed welded tuff. Slightly foliated with relict clasts. Fine-grained. Quartz-feldspars-pyrite (trace)-biotite (trace). |
California |
0 |
Ritter 154, 24 H |
| GRD02A1S0 |
Relict Textures
|
Metavolcanic. Small white rounded clasts could be relict phenocrysts. Dark grey angular clasts are quartz. Original description: Metamorphosed quartz porphyry. Lower Cretaceous |
California |
1 |
Ritter 154, 14 O |
| GRD02A2S0 |
Relict Textures
|
Large sample of stretched pebble conglomerate. Stretched and flattened pink quartzite pebbles in schistose matrix. Biotite-muscovite-anthophyllite-garnet schist matrix. Probably Grenville. Original description: Metaconglomerate. Qtz-Bio-Musc-Anthophyllite-Garnet. Most likely granulite facies. |
Canada |
0 |
Ritter 154, 14 R |
| GRD02A3S0 |
Relict Textures
|
Large sample of metaconglomerate. Polymictitic clasts. Rounded and subrounded clasts of quartzite, slate, and syenite. The clasts range in size from ~1 to 5 cm. Green phyllite matrix. Some weathering on one side of the sample. See also M-331. Original description: Metaconglomerate. |
|
0 |
Ritter 154, 14 R |
| GRD02A4S0 |
Relict Textures
|
Small sample of metaconglomerate. Polymictitic clasts. One large rounded clasts of quartzite with small green clasts of slate and quartzite. Green phyllite matrix. Some weathering on sample. See also M-332. Original description: Metaconglomerate. Weathered. Qtz- chlorite- Fe-oxides. |
|
0 |
Ritter 154, 24 H |
| GRD02A6S0 |
Relict Textures
|
Small sample of green phyllite. Some small quartz and Fe-oxide minerals. Looks just like the matrix of M-331 and M-332. Some weathering on sample. Original description: Metaconglomerate. Weathered. Qtz-chlorite- Fe-oxides. |
|
0 |
Ritter 154, 24 H |
| GRD02A7S0 |
Relict Textures
|
Cryptocrystalline to medium-grained. Bands of quartz (some cherty), feldspar, and phlogopite. Relict bedding planes? |
|
0 |
Ritter 154, 24 H |
| GRD02A8S0 |
Metamorphic Structures
|
Quartz-potassium feldspar-biotite-chlorite (trace) gneiss in contact with potassium feldspar-quartz pegmatite. Gneiss is medium-grained with quartz sigma-clasts. Pegmatite is very coarse-grained. Possibly some vesuvianite? Coarse-grained chlorite between gneiss and pegmatite. |
California |
1 |
Ritter 154, 14 P |
| GRD02AAS0 |
Relict Textures
|
Large sample that grades from biotite-phologopite to tremolite to tremolite-talc layers. All layers are very coarse-grained. Grenville age? Original label: Phlogopite-biotite-talc-tremolite rock. |
New York |
0 |
Ritter 154, 14 R |
| GRD02ABS0 |
Relict Textures
|
Small glaucophane- magnesioreibeckite-quartz-muscovite (trace) schist. Fine- to medium-grained. Original label: Blueschist. |
Mexico |
1 |
Ritter 154, 24 H |
| GRD02ACS0 |
Relict Textures
|
Very fine-grained. Banding/relict bedding. Cryptocrystalline pink and teal mafic beds with dark grey beds. |
|
1 |
Ritter 154, 14 O |
| GRD02AES0 |
Relict Textures
|
Orange (Fe-stained) quartzite with magnetite lenses and tarvertine-filled vugs. Brecciated base? Original label: Breccia with calcium-carbonate (travertine) filling. |
California |
0 |
Ritter 154, 24 H |
| GRD02AFS0 |
Porphyroblasts
|
Cubes of pyrite and chalcopyrite in grey cryptocrystalline matrix. |
Fremont Isle |
0 |
Ritter 154, 24 H |
| GRD02AOS0 |
Porphyroblasts
|
Tremolite-biotite-muscovite schist to gneiss. Large books of biotite (porphyroblasts) in the schist. Tremolite-quartz boudins in gneiss. Original label: Hornblende-carbonate. |
|
1 |
Ritter 154, 14 O |
| GRD02APS0 |
Relict Textures
|
Metavolcanic. Chlorite-quartz-hematite-pyrite (trace). Slightly foliated. Medium-grained quartz porphyroblasts and fine-grained quartz stringers. |
|
0 |
Ritter 154, 24 H |
| GRD02B9S0 |
Reaction Textures
|
Feldspar-garnet-phlogopite-pyrite (trace). Brown relict garnets. Retrograde metamorphism? |
|
1 |
Ritter 154, 14 O |
| GRD02BSS0 |
Folds
|
Fine-grained muscovite schist. Slight folds and crenulations. Slickensides? |
Alps |
0 |
Ritter 154, 14 P |
| GRD02BWS0 |
Folds
|
S-folded gneiss. Phlogopite-biotite-quartz-pyrite (trace). Original description: folded phologopite gneiss. |
|
0 |
Ritter 154, 14 P |
| GRD02BXS0 |
Folds
|
Fine-grained gneiss with ptygmatic folds. Very nice example of folds. |
|
0 |
Ritter 154, 14 P |
| GRD02C3S0 |
Relict Textures
|
Rounded schist and smaller angular black flecks in a very fine-grained greenish/black silicic matrix. Original label: pseudo-tachylite. |
Switzerland |
0 |
Ritter 154, 24 H |
