Mineral Based Composite

Granodiorite

Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)

Porphyritic Basalt

Basalt (with plagioclase or k-feldspar phenocrysts)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 in Matrix)

Serpentinite (with Pyrite/Garnet inclusions)

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Hematoid Quartz

Silicon Dioxide with Iron Oxide Inclusions (SiO2 + Fe2O3)

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

River Sandstone (Lithic Arenite)

Lithic Sandstone (SiO2 dominated with lithic fragments)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Basalt with Quartz/Calcite Veins

Basalt with hydrothermal vein infill

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Diorite

Diorite (Intermediate intrusive igneous rock)

Diorite

Intermediate plutonic igneous rock

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Mica Schist with Quartz

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Schist

Mica Schist

Granodiorite / Granite

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Limestone (with Calcite Veining)

Calcium Carbonate (CaCO3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Raw emerald-bearing beryl (probable)

Beryl, Be₃Al₂Si₆O₁₈; green color from trace chromium and/or vanadium

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial purple dye

Labradorite (Small Tumbled or Water-Worn Fragment)

(Ca,Na)(Al,Si)4O8

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Dendritic Agate

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

Biotite Mica

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

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Biotite Mica

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

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Schist

Mica Schist (Medium-grade metamorphic rock)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Feldspathic Gneiss

High-grade Metamorphic Rock (Gneiss)

Granite

Granite (phaneritic intrusive igneous rock)

Greenstone

Metamorphosed Mafic Igneous Rock

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Pink Granite

Phaneritic intrusive igneous rock (high Potassium-Feldspar)