Sedimentary Or Metamorphic (Base Substrate)

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)

Basalt

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Basalt (with possible iron oxide staining)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt

Africite (Mafic Igneous Rock)

Basalt

Basalt (composition of Plagioclase feldspar and Pyroxene)

Granite (Micro-specimen)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Basalt with Quartz/Quartzite Veins

Aphanitic Mafic Volcanic Rock with Siliceous Infillings

Pink Granite

Granite (Felsic Plutonic Rock)

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)

Granodiorite (River Rock / Cobble)

Granodiorite; Phaneritic intrusive igneous rock dominated by plagioclase, quartz, and hornblende/biotite

Granite

Granite (Felsic Plutonic Rock)

Basalt

Extrusive mafic igneous rock

Basalt (River Pebble)

Extrusive mafic igneous rock

Diorite (Salt and Pepper Rock)

Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)

Granodiorite

Phaneritic intrusive igneous rock (Granodiorite)

Basalt

Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Vesicular Basalt (Amygdaloidal)

Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)

Basalt with Olivine Phenocrysts

Porphyritic Basalt (with (Mg, Fe)2SiO4)

Granodiorite

Granodiorite

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Diorite (River Cobble)

Intermediate plutonic igneous rock

Granite (with Orthoclase and Quartz)

Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)

Granite

Phaneritic Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Porphyritic Basalt or Andesite

Porphyritic Basalt / Andesite

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Vesicular Basalt (River Pebble)

Vesicular Basalt

Vesicular Basalt

Basalt (principally Plagioclase and Pyroxene)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Crushed Stone (Likely Granite or Diabase)

Intrusive Igneous Rock (Granitoid/Gabbroid)

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

White Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Lepidolite in Quartz (or Lepidolite Ore)

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Quartz (SiO2)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Fire Agate

Silicon Dioxide (SiO2) with layered Iron Oxide (Limonite/Goethite)

Dalmation Jasper (Dalmation Stone)

Perthitic feldspar-quartz-amphibole rock

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)

Yooperlite (Syenite clasts with Sodalite)

Fluorescent Sodalite-bearing Syenite

Moss Agate

Silicon Dioxide (SiO2) with inclusions

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)