Metamorphic (Altered Igneous Rock)

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Epidote in Matrix

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Granite

Phaneritic Felsic Igneous Rock

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

Greenschist

Greenschist (Chlorite Schist)

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

River Stone (Basalt or fine-grained Schist)

Mafic Igneous Rock / Volcanic Basalt

Vesicular Basalt

Aphanitic Mafic Igneous Rock (with vesicles)

Basalt River Pebble

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt River Stones

Aphantic Mafic Igneous Rock (Basalt)

Basalt (Beach Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Basalt (Weathered)

Extrusive Igneous Rock (Mafic composition)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt Beach Pebble

Basalt (Aphanitic Mafic Igneous Rock)

River Stone (Basalt)

Basalt (Aphanitic Mafic Igneous Rock)

Fuchsite (Chrome Mica)

Cr-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)

Porphyritic Basalt containing Plagioclase Feldspar phenocrysts

Iolite-bearing Gneiss (Cordierite)

Cordierite (Mg2Al4Si5O18) in Gneiss matrix

Unakite

Epidotized Granite

Anthracite Coal

Anthracite (Carbon Content: 86%-97%)

Greenstone

Chlorite schist or Epidosite

Lapis Lazuli

Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)

Eclogite

Eclogite (Pyrope-Omphacite rock)

Basalt (with possible fine-grained mineralization)

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Magnetite

Magnetite (Fe3O4)

Granite River Pebble

Phaneritic Felsic Igneous Rock (Granite)

Quartzite River Rock

Quartzite (SiO2)

Granite Cobble

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Basalt with Plagioclase Feldspar

Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts

Quartzite

SiO2 (Silicon Dioxide)

Quartzite (Tumbled)

Recrystallized Quartz (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Schist

Mica Schist (Medium-grade metamorphic rock)

Granite

Granite (Phaneritic Igneous Rock)