Mineraloid (Man Made)

Granite

Granitoid

Sandstone

Arenite (typically composed of SiO2)

Limestone

Calcium Carbonate (CaCO3)

Likely basalt or vesicular volcanic rock

Basalt, possibly scoriaceous basalt; exact identification is uncertain from the photograph

Red Jasper

Silicon dioxide (Microcrystalline Quartz, SiO2)

Granite

Granite (felsic intrusive igneous rock)

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Granite

Phaneritic Igneous Rock (Granite)

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Granite

Course-grained intrusive igneous rock

Diabase (also known as Dolerite)

Diabase / Dolerite

Sandstone Pebble

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (with potential mineral inclusions)

Clastic sedimentary rock (primarily Quartz, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Granite River Rock

Phaneritic Felsic Igneous Rock (Granite)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Banded Iron Formation

Banded Iron Formation (BIF)

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Quartz

Quartz (SiO₂)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Dark basalt or fine-grained mafic rock

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Granite Pebble

Granite

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 dominant)

Black basalt (likely polished or cut fragment)

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and often olivine or magnetite