Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Amygdaloidal Basalt with Agate/Chalcedony Infills

Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Pink Granite

Felsic intrusive igneous rock

Porphyritic Basalt (Peanut Obsidian/Star Galaxy-style)

Porphyritic Basalt (Silica-rich Volcanic Rock)

Banded Agate (specifically Moss or River Agate variety)

Cryptocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Basalt

Basalt (Mafic volcanic rock)

Granitic Pegmatite

Granite (with coarse-grained Quartz, Feldspar, and Mica components)

Diorite

Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)

Blue Chalcedony

Chalcedony (Silicon Dioxide, SiO2)

Moss Agate

Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Basalt

Extrusive Mafic Igneous Rock

Quartz

Silicon Dioxide (SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz (River Siltstone Quartzite Pebble)

Silicon Dioxide (SiO2)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Quartzite pebble

Quartzite (SiO2)

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Basalt with Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Porphyry (Flower Stone)

Porphyritic Basalt or Andesite

Agate (Moss or Plume Agate variety)

Silicon Dioxide (SiO2)

Scoria (Lava Rock)

Scoria (Extrusive Igneous Rock / Mafic Silicates)

Quartz River Cobble

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Dalmatian Jasper (or Dalmatian Stone)

Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Beach Pebble)

Clastic sedimentary rock (primarily Quartz and Feldspar)

Obsidian (Black Obsidian)

Amorphous volcanic glass (primarily SiO2)

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Granite

Granite (Phaneritic intrusive igneous rock; primarily SiO2 and Al2O3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)