Metamorphic Or Sedimentary Depending On Local Grade

Quartz Crystal Cluster

Quartz (Silicon Dioxide, SiO2)

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Chalcedony (specifically Blue Chalcedony or Common Opal variety)

Silicon Dioxide (SiO₂)

Granite with Orthoclase and Hematite Staining

Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

Dalmatian Jasper (Dalmatian Stone)

Perthitic feldspar with Arfvedsonite inclusions

Basalt with Epidote (Greenstone)

Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)

Basalt (Greenstone/Trap Rock)

Basalt (dominated by plagioclase feldspar and pyroxene)

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

Limestone

Calcareous Sedimentary Rock (CaCO3)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Dioptase

Dioptase (CuSiO3 · H2O)

Demantoid Garnet on Matrix

Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3

Corundum

Corundum (Aluminium oxide, Al2O3)

Basalt (Greenstone)

Amygdaloidal Basalt / Chloritized Basalt

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Greenstone (Amygdaloidal Basalt)

Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Rhodonite

Rhodonite (MnSiO3)

Chert (specifically Tan Chert)

Chert (SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Limonite (Ironstone Concretion)

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

Banded Calcite (often marketed as Mexican Onyx or Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Moss Agate / Carnelian Agate

Silicon Dioxide (SiO2) with iron and manganese inclusions

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Botryoidal Agate

Chalcedony (Silicon Dioxide, SiO2)

Amethyst

Amethyst (SiO2 with Iron impurities)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Citrine

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Sandstone Clast

Arenite (primarily SiO2)

Pyrite

Iron Disulfide (FeS2)

Amazonite (likely mixed with other feldspars/minerals)

Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Gowganda Tillite (Puddingstone)

Glacial Tillite (Diamictite) with Jasper inclusions

Amethyst

Amethyst (SiO₂)

Galena

Lead(II) Sulfide (PbS)

Botryoidal Agate / Chalcedony Geode

Silicon Dioxide (SiO2)

Limonite Pseudomorph after Pyrite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O) replacing Pyrite (FeS2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Garnet Rhyolite

Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet

Aragonite Star Cluster

Aragonite (Calcium Carbonate - CaCO3)