Mineral, Part Of A Rock

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Amethyst

SiO2 (Silicon Dioxide)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Vesicular Basalt (Iron-Stained)

Mafic Volcanic Rock (Basalt)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Geode (Unopened)

Silica-rich Concretion (primarily SiO2)

Quartzite / Sandstone / Chert Mix

Silicon Dioxide (SiO2)

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (with Iron Oxide staining)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily composed of SiO2 - Silicon Dioxide)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Pink Dyed Agate

Silicon Dioxide (SiO2) with synthetic pigment

Yellow Agate

Chalcedony (cryptocrystalline silica), SiO2

Quartz with Chalcopyrite and Pyrite

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock)

Schist (Biotite Schist)

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

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Pebble (river rock/beach pebble)

Pebble (clast size class)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Grass (Organic Matter/Soil)

Poaceae (family of monocotyledonous flowering plants)

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Unakite

Epidotized Granite

Gneiss

Gneiss (High-grade metamorphic rock)

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Quartz Geode

Silicon Dioxide (SiO2) within a secondary sedimentary structure

Note regarding baguette production (not a rock)

Digital text image - Somali language