Sedimentary And Metamorphic

Orange Calcite (likely polished specimen)

Calcite

Amethyst and mixed gemstone bracelet

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

Calcite

Calcite (CaCO3)

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

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

Likely quartz-rich pebble fragment

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

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

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

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

Limonite pseudomorph after pyrite

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

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)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite-bearing rock, possibly pyrite schist or sulfide ore

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

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

Jasper

SiO2

Clear Quartz

Silicon dioxide (SiO2)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Iron-stained weathered rock

Unknown

Specular Hematite with Quartz and Limonite

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

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

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

White Buffalo Turquoise (or Howlite/Magnesite)

Calcite/Dolomite or Magnesite with Chert/Quartz inclusions

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Mixed Tumbled Rocks and Minerals Collection

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

Quartz

Silicon Dioxide (SiO2)

Agate

SiO2 (Chalcedony/Quartz)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pyrite

Iron Pyrite (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky / Massive Quartz)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Polished hematite bead (probable)

Hematite, Fe₂O₃

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Gravel / Small Pebble

Rock Fragment (Gravel)

Pyrite

Iron Sulfide (FeS2)

Quartz-rich rock, possibly milky quartz or quartzite fragment

Quartz (SiO₂), potentially quartzite if metamorphic

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Pyrite-bearing rock (likely pyrite-rich schist or massive pyrite)

Pyrite, FeS₂, possibly in a micaceous metamorphic matrix