Rock Features List
Click on a feature name to view an information page with images for that feature. The features collection is under construction, so only the highlighted (tan) names have images so far.
Collected Rock Features
- angular grains in matrix: Met (cataclastic), Ign (pyroclastic), Sed (immature)
- carbonate mineral-rich: Met (marbles), Sed (limstones), Ign (carbonatites)
- consistenly aligned mineral grains (foliation): Met
- cross-cutting relationships: Ign (dike), Met (metamorphosed dike)
- ductile deformation: Met
- elipsoidal holes (vesicles): Ign
- euhedral minerals: Met and Ign (crystal forms visible)
- fossils or trace fossils: Sed
- garnet present: Met and Ign
- glass: Ign
- gneissic banding: Met
- igneous only minerals (e.g. sanidine, leucite, pigeonite): Ign
- layering present: Met (metamophosed layered rock), Sed (bedding), Ign (lava flows, pyroclastic rocks)
- layering absent: Met (metamorphosed igneous rock), Ign
- metamorphic only minerals present (e.g. staurolite, chloritoid): Met
- mica-rich (schist): Met
- mosaic texture: Met and Ign (grains not rounded, crystalized in place)
- pillow structures: Ign
- random orientation of grains: Ign, Sed,Met (granofels, conact metam. rocks)
- rounded grains: Sed
- sedimentary rock features (e.g. cross-bedding, ripple marks): Sed
- elipsoidal holes (vesicles): Ign
- volcanic features (e.g. lava flow, spatter cone, etc.): Ign
- xenoliths: Ign
