Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Ruby in Zoisite

Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Moonstone (specifically Cat's Eye or Gray Moonstone)

Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8

Orange Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Moonstone (Feldspar variety)

Orthoclase Feldspar (KAlSi3O8)

Quartzite Cobble

Quartzite (primarily SiO2)

Dumortierite Quartz

Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Marble

Recrystallized Calcite (CaCO3) Rock

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Granite

Phaneritic Intrusive Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Basalt (Vesicular/Amygdaloidal)

Basalt

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

River Pebble (Quartzite or Chert)

Silicon Dioxide (SiO2)

Basalt with Iron Oxide staining

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Gneiss

Gneiss (High-grade metamorphic rock)

Citrine Quartz

Silicon Dioxide (SiO2)

Granite (with alteration)

Granite (Felsic intrusive igneous rock)

Agate (specifically a Thunderegg/Agate Nodule)

Cryptocrystalline Quartz (SiO2)

Jasper (Chocolate or Brown Jasper)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)

Quartz Pebble

Silicon Dioxide (SiO2)

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)

Chert (Jasper variation)

Silicon dioxide (SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock (approx. Na6Ca2(Al6Si6O24)(S,SO4,Cl)1,2)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Quartzite

Quartzite (SiO2)

Limonite (Iron Ore)

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Magnetite

Magnetite (Fe3O4)

Chert

Chert (variant of microcrystalline quartz)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Quartz (Milky Quartz/Citrine Type)

Silicon Dioxide (SiO2)

Olivine (Peridotite)

(Mg, Fe)2SiO4 (Magnesium Iron Silicate)

Clear Quartz

Silicon Dioxide (SiO2)

Bumblebee Jasper (technically Bumblebee Stone)

Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Basalt

Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)