Mineral Or Sedimentary Rock (With Mineral Inclusions)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Biotite Mica

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

Schist (Micaceous Schist)

Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)

Sandstone (Weathered)

Arenite (primarily SiO2)

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Agate (specifically Chalcedony nodule)

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Mexican Crazy Lace Agate

Silicon Dioxide (SiO2) with iron and aluminum inclusions

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Orange Calcite (likely polished specimen)

Calcite

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Pink Opal

Amorphous Hydrous Silica (SiO2·nH2O)

Limestone with Quartz or Calcite Veining

Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions

Sandstone (Ferruginous)

Sandstone (SiO2 with iron oxide inclusions)

Granite

Intrusive Felsic Igneous Rock

Blue Chalcedony

Silicon Dioxide (SiO2)

Sandstone (Quartz-rich Pebble)

Arenite (primarily SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 primary composition)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)