Not A Rock Or Mineral

Red Shale

Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)

Quartzite River Rock

Quartzite (primarily SiO2)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Clear Quartz Cluster

Quartz (Silicon Dioxide - SiO2)

Quartz (specifically Milky or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Sunstone

Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)

Agate (Carnelian-Blue Agate mix)

Silicon Dioxide (SiO2)

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Mica Schist

Medium-grade regional metamorphic rock (composition varies)

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Diorite

Diorite (Intermediate intrusive igneous rock)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Diorite

Diorite (Intermediate plutonic rock)

Quartz (specifically Milky/Gray Quartz vein)

Silicon Dioxide (SiO2)

Mica Schist

Muscovite/Biotite Schist

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Sandstone (Micaceous)

Arenite (primarily SiO2 with Phyllosilicates)

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

Jasper (Zebra Jasper)

Silicon Dioxide (SiO2) with impurities

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (Weathered Coastal Boulder)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 based)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Sandstone

Arenite (primarily SiO2, silica)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Precious Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Ferruginous Sandstone

Clastic Sedimentary Rock (Iron-rich)

Quartzite

Quartzite (primarily SiO2)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Vesicular Sandstone

Clastic Sedimentary Rock (Sandstone)

Desert Rose

Selenite Rose (Gypsum: CaSO4·2H2O)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Amethyst (Druze)

Silicon Dioxide (SiO2) with iron impurities

Granite

Phaneritic Felsic Igneous Rock (Granite)