Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Tumbled yellow jasper or petrified wood fragment

Microcrystalline quartz (chalcedony), SiO₂, possibly iron-oxide-bearing jasper

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Quartz Druzy

Silicon Dioxide (SiO2)

Mixed Tumbled Stones Collection

Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)

Tumbled reddish-brown chalcedony, possibly carnelian

Chalcedony (microcrystalline quartz), SiO₂; red variety commonly called carnelian

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Weathered gray stone, possibly limestone or concrete-like carbonate rock

Tentatively micritic limestone (calcium carbonate, CaCO₃); exact identification is uncertain from the image

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Crystalline Silicon Dioxide (SiO2)

Pegmatite with mica and feldspar

Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica, possibly with tourmaline or sulfides

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Rose Quartz (SiO₂)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or igneous host

Chert / Flint Arrowheads

Cryptocrystalline Quartz (SiO2)

Marble

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), possibly with feldspar, mica, and iron-oxide staining

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Chert with Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt with Calcite Veins

Basalt (Mafic Volcanic Rock)

Sandstone

Quartz Arenite / Sedimentary Rock

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Iron-stained quartz (likely quartzite or quartz-rich rock)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz

Quartz (SiO₂)

Granite or granitic gneiss pebble

Coarse-grained quartz–feldspar–mica rock; likely granite, possibly foliated gneiss

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Milky Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)