Synthetic (Not A Rock Or Mineral)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Sandstone (Pebble)

Arenite (composed primarily of SiO2)

Schist

Mica Schist

Gneiss

Gneiss (Metamorphic rock)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Chrysocolla in Matrix

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O

Gneiss

High-grade metamorphic rock (Gneiss)

Banded Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)

Sandstone with Liesegang Rings

Arenite with Iron Oxide Concretions

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sulfide Ore (likely Galena and Sphalerite in Quartz)

Lead-Zinc Ore (PbS and ZnS)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

White Quartz

Silicon Dioxide (SiO2)

Granitic Pegmatite

Granite Pegmatite (coarse-grained intrusive igneous rock)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Quartz-veined Basalt

Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (with Iron Siderite Concretion)

Arenite with Ironstone Concretion (FeCO3)

Banded Gneiss

Gneiss (Metamorphic Rock)

Granite (Pink/Red)

Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Wishing Stone (Gneiss or Basalt with Quartz Vein)

Gneiss or Metabasalt (with a Quartz or Calcite intrusion)

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Quartz Druzy Geode

Silicon Dioxide (SiO2)

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary vugs

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Sandstone (likely Greywacke variant)

Arenite

Sandstone

Arenite (primarily SiO2)

Sedimentary Sandstone (Sandstone Slab)

Arenite (SiO2 with Fe2O3 staining)

Sandstone (Yellow/Tan Sandstone)

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)