| GRD00FGS0 |
Metamorphic Structures
|
Large sample. Coarse-grained marble with coarse-grained mafic inclusions surrounded by light tan reaction zone. Cc-Amph-Ol-Phlog-Biotite with rusty blebs in mafic inclusions. |
|
0 |
Ritter 154, 14 I |
| GRD01W7S0 |
Crenulation Cleavage
|
A medium-sized sample of chlorite-quartz-pyrite schist. Quartz stringers that contain cubes of pyrite. Beautiful crenulations. |
California |
2 |
Ritter 154, 14 P |
| GRD01W9S0 |
Folds
|
Very large sample of folded tremolite-talc (?)-carbonate schist. Well-foliated. |
New York |
0 |
Ritter 154, 14 R |
| GRD01WAS0 |
Crenulation Cleavage
|
Two small samples of specularite schist. |
Michigan |
0 |
Ritter 154, 14 P |
| GRD01WZS0 |
Folds
|
Large sample of folded chlorite-biotite-muscovite schist. Very well foliated, coarse-grained with nice crenulations. (Original label: M-146.) |
|
0 |
Ritter 154, 14 P |
| GRD01WZS1 |
Folds
|
Smaller sample of folded chlorite-biotite-muscovite schist. Very well foliated, coarse-grained with nice crenulations. (Original label: M-147.) |
|
0 |
Ritter 154, 24 I |
| GRD01X1S0 |
Folds
|
Well-developed foliation. Quartz-biotite-phologopite(?) gneiss. Small ptygmatic folds. |
New Zealand |
1 |
Ritter 154, 14 P |
| GRD01X4S0 |
Folds
|
Small quartz folds in fine-grained blue matrix. Blue: magnesioreibeckite (?), glaucophane (?). Original description: folded gneiss; blue schist facies? |
|
0 |
Ritter 154, 14 P |
| GRD01X4S1 |
Folds
|
Small quartz folds in fine-grained blue matrix. Blue: magnesioreibeckite (?), glaucophane (?). Original description: folded gneiss; blue schist facies? |
|
0 |
Ritter 154, 14 P |
| GRD01X5S0 |
Lineation
|
Calcite-quartz-muscovite-pyrite. Contact between marble-schist. Nice lineations. Slight banding. |
|
1 |
Ritter 154, 14 P |
| GRD01XPS0 |
Lineation
|
Large sample of gneiss composed of plagioclase-biotite-quartz. Well-foliated with lineations. Fine- to medium-grained. Original description: hornblende gneiss or amphibolite; Jurassic-Cretaceous. |
California |
1 |
Ritter 154, 24 I |
| GRD01XYS0 |
Lineation
|
Medium-sized sample of a geniss compsed of quartz-plagioclase-potassium-feldspar (?)-biotite. Medium-grained and well-foliated. Not the best example of a gneiss, but a good sample of lineations. N30E dip 30 plunge 31. |
|
0 |
Ritter 154, 24 I |
| GRD01Y0S0 |
Lineation
|
A slab of gneiss composed of quartz-plagioclase-biotite. Well-foliated and medium- to coarse-grained. A nice example of a lineated gneiss. |
|
1 |
Ritter 154, 14 P |
| GRD01Y1S0 |
Folds
|
Medium-sized polished sample of gniess composed of biotite-quartz-garnet (minor). Ptygmatic folds of quartz. N30E 52 dip E20 plunge. |
|
0 |
Ritter 154, 14 P |
| GRD01Y7S0 |
Veins
|
Calcite/carbonate veins and pockets in green chlorite. Occasional quartz crystals. Original description: micaceous marble with calcium carbonate veins. |
California |
0 |
Ritter 154, 24 I |
| GRD01YES0 |
Folds
|
Folded grey and white marble. Possibly relict folded bedding (?) from an impure limestone. Carbonate-biotite (black specks and layers). |
California |
1 |
Ritter 154, 14 P |
| GRD01YHS0 |
Folds
|
Fine-grained, finely banded marble with tight folds. Relict fossil (?) or porphyroblast. |
Darwin Area |
0 |
Ritter 154, 14 P |
| GRD01YUS0 |
Relict Textures
|
Well-foliated. Stretched quartzite pebbles (~3 in length). Chlorite-biotite-muscovite schist between pebbles. |
California |
0 |
Ritter 154, 14 O |
| GRD01ZRS0 |
Crenulation Cleavage
|
Anthophyllite (tremolite) schist. Well-foliated with crenulation cleavage. |
New York |
0 |
Ritter 154, 24 I |
| 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 |
| 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 |
| GRD020YS0 |
Folds
|
Quartz-mica-pyrite schist. Thin, well-formed, and bent banding. Cubic pyrite (rare). Very pronounced banding and hardness. Intense mylontization? |
Switzerland |
0 |
Ritter 154, 24 I |
| GRD020ZS0 |
Folds
|
Carbonate-biotite-quartz-amphibole-muscovite schist with folded laminae and ptygmatic folds. Melanocratic layers: biotite, carbonate, quartz. Leucocratic layers: carbonate, biotite, trace muscovite. Medium-grained quartz veins cutting across and along laminae. Marl protolith? Original description: Q-Bi gneiss with ptygmatic folds. |
|
1 |
Ritter 154, 14 P |
| GRD021AS0 |
Relict Textures
|
Large sample is well-banded (quartz and fine-grained slate) and dense. Cryptocrystalline materials with soft-sediment type structures. Highly recrystallized (?). |
|
0 |
Ritter 154, 24 M |
| GRD029JS0 |
Veins
|
Large white carbonate veins in dark green, fine-grained serpentinite(?) |
Mexico |
0 |
Ritter 154, 24 I |
| GRD029KS0 |
Relict Textures
|
Stretch pebble conglomerate. Stretched white quartzite pebbles in a biotite-muscovite-quartz schist matrix. |
California |
0 |
Ritter 154, 14 O |
| GRD029LS0 |
Folds
|
Relict sandstone-limestone bedding that has been folded. The larger, grey beds are marble while the thinner beds are quartzite. One side of the sample is very weathered. Original label: folded intercalated sandstone-limestone. |
|
0 |
Ritter 154, 24 I |
| GRD029MS0 |
Relict Textures
|
Deformed/flattened quartzite pebbles in a gneissic matrix. Quartz-potassium feldspar- biotite-muscovite (trace)- amphibole (trace). Biotite mantles the quartzite pebbles. Original label: porphyroblastic gneiss. |
Arizona |
0 |
Ritter 154, 14 O |
| GRD029NS0 |
Relict Textures
|
Large sample of angular polymictic clasts in a matrix composed of quartz-feldspars-pyrite (trace). |
|
0 |
Ritter 154, 17 B |
| GRD029OS0 |
Relict Textures
|
Large cut sample with relict bedding structures. Beds are wavy. Abundant quartzite. Dolomite is not evident. Original label: Diopside-dolomite marble. |
|
0 |
Ritter 154, 14 O |
