Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Banded Gneiss

Gneiss (Metamorphic Rock)

Greenstone

Metabasalt (composed of chlorite, epidote, and actinolite)

Gneiss

High-grade Metamorphic Gneiss

Granodiorite (Gneissic texture)

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

Greenstone

Metabasalt / Greenschist facies rock

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Gneiss with Quartz/Feldspar Vein

Felsic to intermediate gneiss

Agate (Polished Sphere)

Silicon Dioxide (SiO2)

Amethyst (Quartz variety)

Amethyst [Silicon Dioxide (SiO2)]

Biotite Mica

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

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Labradorite (likely)

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

Quartzite River Rock

Metaquartzite (majorly SiO2)

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Feldspathic Gneiss

High-grade Metamorphic Rock (Gneiss)

Chert / Flint Handaxe

Cryptocrystalline Quartz (SiO2)

Serpentine / Antigorite

Mg3Si2O5(OH)4 (Serpentine Group)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Colorless Quartz (Rhinestone)

Silicon Dioxide (SiO2)

Biotite Schist

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

Greenstone (Epidisite / Chlorite Schist)

Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz Geode

Quartz (Silicon Dioxide, SiO2) Geode

Citrine

Silicon Dioxide (SiO2)

Biotite on Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)

Amphibolite / Biotite Schist

Amphibolite (rich in Hornblende and Plagioclase feldspar)

Marble

Recrystallized Calcite (CaCO3)

Coquina

Biogenic Limestone (Calcium Carbonate - CaCO3)

Coquina

Bioclastic Limestone

Citrine

Silicon Dioxide with iron impurities (SiO2)

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Hematite

Hematite (Fe2O3)

Basalt River Stone

Extrusive mafic igneous rock (Basalt)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Iridescent schist or phyllite

Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)