Igneous

Dark igneous rock, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Dark weathered igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Biotite in Host Matrix

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica or amphibole

Weathered granite fragment

Granite, a quartz–feldspar–mica intrusive rock

Amber (likely a small rough amber piece)

Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral

Dalmatian Jasper

Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)

Granite

Granite (Phaneritic intrusive igneous rock)

Dalmatian Jasper (Dalmatian Stone)

Perthitic Feldspar with Arfvedsonite/Riebeckite

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Granite

Phaneritic Plutonic Felsic Rock

Granite Cobble

Granite

Granite

Granite

Polished orbicular stone, likely granite or diorite

Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Granite Pebble

Igneous Intrusive Rock (Quartz-Feldspar-Mica Phenocrysts)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Granite

Granite (Felsic Plutonic Rock)

Granite

Intrusive igneous rock (SiO2 range 65-75%)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Weathered rock fragment (likely granite or granitic gneiss)

Undetermined felsic rock; possibly quartz–feldspar granite

Fossiliferous limestone fragment

Calcitic limestone; mainly calcium carbonate (CaCO₃), possibly with shell or coral debris

Polished dark mafic rock, likely basalt or gabbro

Basalt–gabbroic rock; mainly plagioclase feldspar, pyroxene, and possibly olivine/amphibole

Biotite granite (weathered granitic rock)

Granite, chiefly quartz–feldspar–biotite; approximate composition SiO₂-rich, with K-feldspar and plagioclase

Foliated metamorphic rock, likely mica schist

Mica schist, mainly quartz–feldspar–mica assemblage

Granite River Cobble

Granitoid (comprising Quartz, Feldspar, and Mica)

Crushed Granite Gravel

Granite (Plagioclase feldspar, Quartz, Alkali feldspar, Biotite)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Dalmatian Jasper

Peralkaline rhyolite with arfvedsonite inclusions

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Indigo Gabbro

Gabbro (Alkali Gabbro)

Granite

Granite

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Granite

Granite (Felsic Plutonic Rock)

Dalmation Stone

Dalmation Jasper (Igneous microcrystalline quartz with arfvedsonite)

Rose Quartz

Silicon dioxide (SiO2)

Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Quartz (Tumbled)

SiO2 (Silicon Dioxide)