Sedimentary Or Metamorphic

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / MgCO3 (Magnesite substrate)

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

Mixed Tumbled Rocks and Minerals Collection

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

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Green Opal

Hydrated Silica (SiO2·nH2O)

Red Jasper

Jasper (Silicon Dioxide Si₂O₃)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Gold-colored mineral specimen, likely pyrite or weathered mica schist

Tentatively pyrite (FeS₂); identification is uncertain from the obscured image

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Beach Pebbles and Quartz Aggregates

Quartz pebbles and biogenic fragments (SiO2, CaCO3)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Tumbled quartz-rich carbonate rock

Likely massive quartz (SiO₂), possibly calcite-bearing marble or limestone

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Quartz Vein in Matrix (Breccia / Host Rock with Quartz)

Silicon Dioxide (SiO2) in Host Rock Matrix

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Polished hematite bead (probable)

Hematite, Fe₂O₃

Quartz (Milky / Massive Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Small gold-colored mineral crystal, likely pyrite

Pyrite (FeS₂), tentatively; native gold is a less likely alternative

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Red Jasper (Quartzite)

Silicon Dioxide (SiO2) with iron oxide inclusions

Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)

Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Pyrite

Iron Pyrite (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)