Sedimentary Or Igneous (Secondary Formation)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Geode (partially opened)

Silicon Dioxide (SiO2) with iron staining

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Optical Calcite

Calcium Carbonate (CaCO3)

Rhodochrosite

Manganese carbonate (MnCO3)

Hematite / Goethite (Iron Ore)

Iron Oxide (Fe2O3 / FeO(OH))

Weathered quartz-bearing metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica assemblage; exact mineral identification requires testing

Limonite (Gozzany Iron)

Limonite (FeO(OH)·nH2O)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Weathered metamorphic rock, likely schist or gneiss

Quartz–feldspar–mica metamorphic rock; exact identification requires testing

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Pink Granite

Plagioclase-Quartz-K-Feldspar Granite

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Chert (with Quartz Veining)

Microcrystalline silicon dioxide (SiO2)

Variscite (or potentially a turquoise/variscite matrix cabochon, or an impression jasper)

AlPO4·2H2O (Variscite) or related phosphate/silicate material depending on exact composition

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Unidentified polished stone fragments

Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock

Geode

Quartz / Chalcedony nodule

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Weathered quartz-rich metamorphic rock, likely gneiss or quartzite

Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph

Gold Flake

Native Gold (Au)

Quartz Druze (Crystalline Quartz)

Silicon Dioxide (SiO2)

Likely mica-rich schist (possibly phyllite)

Muscovite–biotite schist; exact identification requires examination of a fresh surface

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Quartz with iron staining

Silicon dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Green Calcite

Calcium Carbonate (CaCO3)

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Polished orbicular stone, likely granite or diorite

Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite

Hematite (Nodular or Botryoidal)

Iron(III) oxide (Fe2O3)

Geode

Quartz / Chalcedony nodule

Jasper Agate

Chalcedony (Silicon Dioxide - SiO2)

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Banded Chert or Agate

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Weathered vesicular volcanic rock, likely pumiceous andesite or rhyolite

Pumiceous intermediate-to-felsic volcanic rock; commonly composed of plagioclase, quartz, alkali feldspar, and volcanic glass, with possible iron-oxide staining

Weathered quartz-rich metamorphic rock, likely gneiss or quartzite

Quartz (SiO₂)-bearing gneiss; exact identification requires a fresh surface and tests