Mineral, Part Of A Rock

Granite

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Gastropod Steinkern (Fossil Snail Internal Mold)

Class Gastropoda (Internal Mold)

Thunderegg (Agetized Geode nodule)

Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)

Jade

There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.

Gneiss

Gneiss (High-grade regional metamorphic rock)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Ferruginous Sandstone

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Desert Rose

Gypsum (variety Selenite) or Barite, CaSO4·2H2O

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Ruby in Fuchsite

Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Granite

Granite

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Felsic Plutonic Rock)

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Agate

Silicon dioxide (SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide - SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Limonite (Iron Ore/Sandstone mixture)

Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Shungite

Shungite (carbon-rich Precambrian rock)

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Granite Cobble

Phaneritic Plutonic Felsic Rock

Gneiss

Gneiss (High-grade regional metamorphic rock)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Granite

Granite (Phaneritic Acidic Igneous Rock)

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)