Sedimentary Rock (Possibly Composed Of Various Minerals)

Quartz Geode

Silicon Dioxide (SiO2)

Diorite

Intermediate Phaneritic Igneous Rock

Quartz

SiO₂ (Silicon Dioxide)

Amethyst-bearing quartz cluster

Quartz, SiO₂; purple coloration from irradiation and trace iron

Chert (Light Variety)

Sedimentary cryptocrystalline quartz (SiO2)

Puddingstone (Polished Pebble)

Conglomerate (Quartz-rich)

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Small seashell fossil or shell fragment

Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate

Granite

Felsic intrusive igneous rock

Chert with Epidote and Jasper inclusions

SiO2 (Silicon Dioxide) with Ca2(Al, Fe)3(SiO4)3(OH) inclusions

Jasper (or possibly Agate/Chalcedony) beads

SiO2 (Silicon Dioxide)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)

Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.

Zebra Jasper

Impure variety of Silica (SiO2)

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Possible weathered quartz-rich rock or iron-stained mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Dragon Blood Jasper

SiO2

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Conglomerate with Quartzite Pebbles

Clastic sedimentary rock (Conglomerate)

Brachiopod Fossil

Phylum Brachiopoda

Limonite (also known as Yellow Ochre or Brown Hematite)

Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Chert (Jasper) Pebble

Microcrystalline Quartz (SiO2)

Travertine

Calcium Carbonate (CaCO3)

Brown Jasper

Silicon Dioxide (SiO2)

Psilomelane (Black Hematite varietal)

Barium Manganese Oxide (Ba,H2O)2Mn5O10

Clear quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Basalt

Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)

Septarian Nodule Geode

Septarian concretions (composed of Calcite, Aragonite, and Limestone)

Tumbled limestone or marble fragment

Calcite (CaCO₃), likely marble; possibly compact limestone

Tumbled dark stone, likely basalt or basaltic rock

Fine-grained mafic igneous rock; commonly basalt, composed mainly of plagioclase and pyroxene with possible olivine

Soapstone

Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Dalmation Jasper (Dalmation Stone)

Perthitic feldspar-quartz-amphibole rock

Basalt

Basalt

Dolomite on Prehnite (Saddle-shaped Dolomite)

Dolomite [CaMg(CO3)2] on Prehnite [Ca2Al(AlSi3O10)(OH)2]

Granite

Phaneritic Felsic Igneous Rock

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)