Man Made Object (Metal Alloy)

Peridot

Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Basalt (Water-worn Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Carnelian

Carnelian Chalcedony (SiO2)

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Quartz-rich vein rock, likely milky quartz in weathered host rock

Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining

Sandstone

Clastic Sedimentary Rock

Granite (weathered)

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Granite (High-silica plutonic rock)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Limestone

Calcium Carbonate (CaCO3)

Granite

Granite (a plutonic igneous rock)

Marble

Metamorphosed Limestone/Dolomite

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Granite

Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Quartzite (Iron-stained)

Quartzite (SiO2 with iron oxides)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Orange Calcite

Calcite (CaCO3)

Granite

Phaneritic Felsic Igneous Rock

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Weathered sandstone or granitic rock fragment

Likely quartz-rich sandstone; exact identification requires testing

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Limestone

Calcium Carbonate (CaCO3)

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Serpentinite

Serpentinite (composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite)

Quartz

Silicon Dioxide (SiO2)

Granite

Granite (a common term for a felsic intrusive igneous rock)

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Chalcedony (Common Opal/Chert variety)

Silicon Dioxide (SiO2)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Limestone

Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Milky Quartz

Quartz (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Foliated metamorphic rock, likely biotite schist

Mica schist, chiefly quartz, feldspar, and biotite mica

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Puddingstone

Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)