Sedimentary To Metamorphic

Quartz-rich limestone or calcitic marble

Calcite (CaCO₃), possibly with quartz (SiO₂)

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Amethyst and mixed gemstone bracelet

Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads

Pyrite-bearing rock (likely pyrite schist or pyritized shale)

Pyrite (FeS₂) in a fine-grained schistose or shale matrix

Weathered quartz-rich rock fragment

Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

Possible shale or slate fragment

Fine-grained clay-rich rock; possibly slate (low-grade metamorphosed shale)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Brown quartz-rich pebble (likely chert or weathered quartzite)

Quartz (SiO₂), possibly microcrystalline quartz/chert or quartzite

Calcite

Calcite (CaCO3)

Green chalcedony (possibly chrysoprase) cabochon

Chalcedony, microcrystalline quartz (SiO₂); chrysoprase is nickel-colored chalcedony

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂ with iron-oxide coatings)

Likely quartz-rich pebble fragment

Quartz (SiO₂), possibly milky quartz or quartzite; the photo is insufficient to distinguish them confidently

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Orange Calcite (likely polished specimen)

Calcite

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Jasper

SiO2

Pyrite-bearing rock, possibly pyrite schist or sulfide ore

Pyrite (iron disulfide, FeS₂), likely intergrown with dark metamorphic host minerals

Iron-stained weathered rock

Unknown

White Buffalo Turquoise (or Howlite/Magnesite)

Calcite/Dolomite or Magnesite with Chert/Quartz inclusions

Limonite pseudomorph after pyrite

Goethite / Limonite pseudomorph after Pyrite (Fe3+O(OH) replacing FeS2)

Metallic sulfide-rich rock, possibly pyrite-bearing schist or marcasite specimen

Likely pyrite (FeS₂) in a foliated host rock; exact identification requires testing

Agate

SiO2 (Chalcedony/Quartz)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Pyrite

Iron Pyrite (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix

Gravel / Small Pebble

Rock Fragment (Gravel)

Fluorite

Calcium Fluoride (CaF2)

Clear Quartz

Silicon dioxide (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Agate

Chalcedony (SiO2)

Pyrite

Iron Pyrite (FeS2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Pyrite

Iron Sulfide (FeS2)

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Zoisite with Hornblende

Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions

Pyrite

Iron Disulfide (FeS2)