Mineral, Specifically A Rock Fragment

Breccia

Clastic Breccia

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Gravel or Crushed Stone

Fragmented Aggregate Stone

Dinosaur Bone (Gembone)

Petrified Dinosaur Bone (Apatite/Silica replacement)

Quartz fragment (Pebble)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Quartz Pebble

Silicon Dioxide (SiO2)

Snowflake Obsidian

Obsidian with Cristobalite inclusions

Greywacke with Quartz Vein

Greywacke (immature sandstone) with SiO2 inclusions

Dalmation Jasper (or Dalmation Stone)

Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)

Chalcedony (Blue Dragon/Gray Chalcedony)

Silicon Dioxide (SiO₂)

Orange Calcite

Calcium Carbonate (CaCO3)

Granite Gravel (Pebble)

Intrusive Felsic Igneous Rock

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Quartz (with probable host rock)

Silicon Dioxide (SiO2)

Sedimentary Rock Fragments

Clastic Sedimentary Rock

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

River Pebble

Polished Quartzite or Mixed Lithology

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Dalmatian Jasper

Peralkaline Feldspar Diorite/Rhyolite

Quartz / Common Opal

Silicon Dioxide (SiO2)

Granite or granitic rock fragment

Coarse-grained felsic intrusive rock, chiefly quartz, feldspar, and mica/amphibole

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Weathered granite or granitic gneiss fragment

Granite, predominantly quartz, feldspar, and dark mica/amphibole

Weathered iron-rich rock, possibly basalt or ironstone

Uncertain; likely weathered basalt (plagioclase–pyroxene) or hematite/goethite-bearing ironstone

Milky quartz (likely quartz-rich vein fragment)

Quartz, silicon dioxide (SiO₂)

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Feldspar (specifically Orthoclase)

Potassium aluminum silicate (KAlSi3O8)

Pebble / Rounded Rock

Lithic fragment / Water-worn rock

Dalmatian Stone

Aplite (often incorrectly called Dalmatian Jasper)

Likely gray granite fragment

Granite, composed mainly of quartz, feldspar, and mica

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)