Mineral Or Sedimentary Rock (With Mineral Inclusions)

Granite

Phaneritic Felsic Igneous Rock

Small quartz-rich stone, possibly iron-stained quartz or jasper

Quartz (SiO₂), potentially with iron-oxide inclusions

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Quartz-rich geode or vuggy quartz rock

Quartz (SiO₂), likely with minor iron oxides and possibly calcite or feldspar

Orange Calcite

Calcium Carbonate (CaCO3)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Granite

Phaneritic Felsic Igneous Rock

Milky quartz vein rock

Quartz (SiO₂), likely in a quartz-rich host rock with minor iron-stained minerals

Polished dendritic agate or jasper pebble

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide inclusions

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Tumbled yellow jasper or silicified rock fragment

Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored

Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)

Pegmatitic Igneous Rock

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; predominantly SiO₂

Biotite Schist

Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Tumbled milky quartz

Quartz (SiO₂), likely milky quartz

Quartz-rich chalcedony (likely milky quartz/chert)

Silica, chiefly quartz and microcrystalline quartz (SiO₂); exact variety is uncertain from the photograph

Polished orange-brown jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Dalmatian Stone

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Likely amber or yellow-brown chalcedony/jasper fragment

Uncertain; possible amber (fossilized resin) or iron-stained chalcedony/quartz

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Snowflake Obsidian

Obsidian with Cristobalite inclusions

Orange chalcedony / iron-stained agate

Microcrystalline quartz (SiO₂), likely limonite/goethite-stained chalcedony

Raw yellow chalcedony or quartz-bearing rock

Microcrystalline silica, SiO₂ (likely chalcedony/quartz; exact identification requires testing)

Conglomerate

Polymictic Conglomerate

Tumbled milky quartz, possibly quartzite

Quartz (SiO₂); the specimen may be a quartz-rich metamorphic rock if its texture is granular

Sandstone Clast

Arenite (primarily SiO2)

Basalt with Calcite Veins

Extrusive Igneous Rock

Basalt with Olivine and Scoria

Extrusive Igneous Rock

Polished brecciated jasper

Brecciated chalcedony/quartz aggregate, chiefly SiO₂ with iron-oxide inclusions

Red Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Amygdaloidal Basalt

Basalt with secondary mineral infilling (SiO2/CO3)

Dalmatian Jasper

Feldspar porphyry (Microcline and Quartz with Arfvedsonite spots)

Rounded river pebble, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone

Green Jasper

Silicon Dioxide (SiO2) with impurities

Quartz-bearing granite or pegmatite fragment

Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende

Pink Mimbres Agate / Plume Agate

Silicon dioxide (SiO2) with mineral inclusions

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Chert / Jasper

Microcrystalline Quartz (SiO2)

Siltstone or Fine-grained Sandstone pebble

Siltstone (primarily SiO2 with clay minerals)