Mineral, Possibly Rock Fragment Containing A Mineral

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite and Calcite inclusions

Shale

Shale (Consolidated fine-grained clay/silt)

Mica Schist with Pyrite

Mica Schist (FeS2 containing)

Pink Granite (Unakite-bearing Granite Pebble)

Granite (rich in Potassium Feldspar / Orthoclase)

Gneiss

Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Fossiliferous Limestone Pebble

Calcite-rich Fossiliferous Marine Limestone

Quartz-bearing altered rock, possibly iron-stained quartz vein

Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining

Quartz Vein Rock

Quartz (Silicon Dioxide, SiO2)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Coarse-grained Quartz and Feldspar Pegmatite

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Lapis Lazuli

Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Siltstone (or Red Shale)

Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Conglomerate

Clastic Sedimentary Rock

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Flower Agate (Plume Agate)

Chalcedony (Silicon Dioxide) with Spherulitic Inclusions - SiO2

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

Polished orbicular jasper (probable ocean jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Weathered sandstone or granitic rock fragment

Likely quartz-rich sandstone; exact identification requires testing

Black Shale

Argillaceous Chert/Shale

Coarse-grained Granite

Granitoid (Felsic Plutonic Rock)

Red Sandstone

Clastic Sandstone (typically Quartz-rich with Iron Oxide)

Weathered quartz-bearing rock, possibly sandstone or quartzite

Provisional: quartzite (mostly SiO₂); could alternatively be iron-stained quartz sandstone

Granite with Tourmaline

Felsic intrusive igneous rock containing schorl (tourmaline)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cement)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Likely weathered iron-rich rock

Probable basalt or limonite/goethite-stained mafic rock; exact identification requires testing

Porphyritic Basalt (with Olivine or Quartz phenocryst)

Porphyritic Basalt (Mafic Extrusive)

Schist

Mica Schist

Quartz Vein in Granite

Crystalline Silicon Dioxide (SiO2) in Granitic Matrix

Quartz-rich pegmatite fragment

Granite-family pegmatite; chiefly quartz (SiO₂), feldspar, and black mica (biotite)

Granodiorite

Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)

Weathered iron-rich rock, possibly limonite/goethite or ironstone

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite and/or magnetite)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Sandstone

Clastic Sedimentary Rock

Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite

Quartz (SiO₂), potentially with feldspar and iron-oxide staining