Mineral, Part Of A Rock

Serpentine (Healerite variety)

Serpentine group, Mg3Si2O5(OH)4

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Granite (Orthoclase rich)

Granite (composed primarily of Quartz and Potassium Feldspar KAlSi3O8)

Rounded gray pebble, likely basalt or andesite

Fine-grained volcanic rock, probably basaltic-andesite; exact identification requires testing

Basalt (Vesicular)

Basalt (Extrusive Mafic Igneous Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Quartz (in a rock matrix)

Quartz (SiO2)

Weathered sandstone fragment

Quartz-rich sandstone, likely iron-oxide-stained litharenite

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe)3Si2O5(OH)4

Gabbro (potentially weathered)

Mafic Plutonic Rock (Gabbro/Diabase)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Yellow Quartzite (River Pebble)

Crystalline Quartz (SiO2)

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Granite

Granite (Felsic intrusive igneous rock)

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Granite (Weathered)

Grano-diorite / Granite (SiO2 rich intrusive rock)

River Pebble (Basalt or Gabbro)

Mafic Igneous Rock

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Quartzite (River Pebble)

Quartzite (SiO2)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Granite

Plutonic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Granite

Granite (Felsic Plutonic Rock, consisting primarily of Quartz, Feldspar, and Mica)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Weathered granite or granitic gneiss pebble

Granite, primarily quartz, feldspar, and mica; possibly weakly foliated gneiss

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Ptygmatic Migmatite

Migmatite (consisting of Neosome and Paleosome fractions)

Granite Water-Worn Pebble

Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)

Quartz Druzy on Matrix

Silicon Dioxide (SiO2)

Ferruginous Quartz (Red Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Granite Cobble

Phaneritic Felsic Igneous Rock

Red Quartzite / River Siltstone

Quartzite (SiO2 with iron oxide inclusions)

Weathered Quartzite or Chert Pebble

Silicon Dioxide (SiO2)

Chert (Jasper-bearing)

Chert (Silicon Dioxide, SiO2)

River Pebble (Quartzite/Sandstone mix)

Quartzite (primarily SiO2)