Igneous And Mineral

Gneiss

Gneiss (Metamorphic high-grade)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Phaneritic igneous rock consisting of Quartz, Feldspar, and Mica)

Basalt (with possible Olivine inclusions)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt

Basalt (composition predominately plagioclase feldspar and pyroxene)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite

Phaneritic Igneous Rock (Granitic)

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Yooperlite

Fluorescent Sodalite-bearing Syenite

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Basalt River Stone

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Granite Cobble

Granite

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica/Amphibole)

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.

Vesicular Basalt

Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granite

Phaneritic Intrusive Igneous Rock (Granite)

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Greenschist

Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)

Granite

Granite (a felsic intrusive igneous rock)

Aquamarine

Beryl (Be3Al2Si6O18)

Topaz

Topaz (Al2SiO4(F,OH)2)

Quartz Crystal

Quartz (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Titanium Quartz (Rough)

Titanium-included Silicon Dioxide (SiO2 + Ti)

Blue Sapphire

Corundum (Al2O3)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Obsidian

Obsidian (Amorphous volcanic glass, predominantly SiO2)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Obsidian

Obsidian (Volcanic Glass) SiO2 (70% or more)

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)