Mineral, Possibly Rock Fragment Containing A Mineral

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Amethyst (Geode Fragment)

Silicon Dioxide with iron impurities (SiO2)

Chert Nodules (with Gryphaea or Shell inclusions)

Microcrystalline Quartz (SiO2) with Calcitic inclusions

Likely tumbled calcite or pale limestone fragment

Calcite (CaCO₃), possibly microcrystalline limestone

Weathered limestone or calcareous rock

Calcite-rich limestone (predominantly CaCO₃), possibly fossiliferous

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Likely quartz-bearing mineral aggregate

Quartz (SiO₂), possibly mixed with mica or feldspar

Weathered granitic rock fragment

Granite, predominantly quartz–feldspar–mica assemblage

Banded Greywacke

Greywacke (Lithic wacke)

Sandstone (Quartzose)

Arenite (SiO2)

Coquina / Shelly Sandstone

Calcareous Sandstone / Coquina

Orange calcite fragment

Calcite (CaCO₃), likely iron-stained or orange-colored calcite

Weathered iron-rich rock, possibly hematite-bearing breccia

Hematite (Fe₂O₃)-rich lithic fragment; exact host rock is uncertain from the image

Sandstone (Calcareous/Lithic)

Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)

Shale

Laminated Mudstone

Small weathered stone, possibly quartz-rich granite or feldspar

Indeterminate granitoid fragment; likely quartz (SiO₂) and feldspar, with minor mica or iron oxides

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Ironstone Concretion

Siderite or Hematite Concretion

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (SiO2 principal component)

Sandstone (Greywacke/Siltstone variant)

Arenite / Wacke (SiO2 with diverse mineral inclusions)

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Asphalt Chunk

Asphalt concrete

Raw greenish crystal/mineral fragment

Uncertain from image; possibly olivine (forsterite-rich), epidote, or green tourmaline

Brecciated quartz-rich rock, possibly silicified breccia

Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining

Sandstone

Arenite (SiO2 primarily)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Sandstone

Arenite (composed primarily of SiO2)

Weathered dark rock fragment

Indeterminate; possibly basalt or iron-rich volcanic rock

Sandstone (with potential Concretion or Fossil fragment)

Arenite (primarily SiO2)

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Sandstone

Arenite (SiO2 primarily)

Likely weathered granite or granitic gneiss fragment

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed

Chert Nodule (Fossiliferous Chert)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Granite

Granite (Felsic Plutonic Rock)

Granite

Intrusive Igneous Rock

Gravel / Limestone Fragment

Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)