Organic Material (Likely A Fruit Or Berry)

Chert (Flint)

Microcrystalline Silica (SiO2)

Tumbled dark green stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄)

Chert (Red/Pink Jasper subtype)

Silicon Dioxide (SiO2)

Amber

Succinite (Resinite)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Green Jasper)

Microcrystalline Quartz (SiO2) with iron silicate inclusions

Flagstone paving (likely sandstone or limestone)

Clastic sandstone or carbonate limestone; exact identification requires testing

Iron-rich concretion or weathered ironstone

Goethite–hematite limonite aggregate; commonly described as limonite or ironstone

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Honey calcite (calcite-rich limestone/marble fragment)

Calcite — CaCO₃; likely coarse crystalline calcitic rock

Sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor lazurite/pyrite or calcite inclusions

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with iron-oxide staining and minor feldspar or mica

Schist

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Polished pale stone, likely limestone or quartzite pebble

Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy

Chert (Jasper/Common Chert)

Microcrystalline Quartz (SiO2)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

Quartz-rich granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly weakly metamorphosed

Quartz Pebble

Crystalline Silica (SiO2)

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Chert (Black Flint)

Silicon Dioxide (SiO2)

Tumbled gray feldspar-rich stone, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite

Weathered iron-rich rock, possibly basalt or ironstone

Indeterminate; likely Fe-oxide-bearing basaltic rock (commonly magnetite/hematite in a silicate matrix)

Chert (specifically a stream-worn Chert Nodule)

Sedimentary Cryptocrystalline Quartz (SiO2)

Polished amethyst pyramid

Amethyst, purple quartz (SiO₂)

Weathered sandstone (probable)

Quartz-rich sandstone, largely composed of cemented quartz grains (SiO₂)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss

Biotite-rich granite or granitic gneiss

Granite; quartz–feldspar–biotite assemblage

Weathered volcanic rock, likely andesite or basalt

Fine-grained mafic to intermediate volcanic rock; probable andesite–basalt, compositionally dominated by plagioclase with pyroxene and possibly alteration minerals

Fossiliferous Limestone / Fossil Fragment

Calcium Carbonate Matrix with Biogenic Inclusions (CaCO3)

Chert (Chert / Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert/Jasper nodule)

Microcrystalline Quartz (SiO2)

Agatized Fossil (Druzy Agate)

Silicon Dioxide (SiO2) replacing organic matter

Chert (Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Polished copper-bearing mineral specimen, likely malachite-rich copper ore

Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite