Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

sedimentary

Granite (Kitchen Countertop)

Granite (Felsic intrusive igneous rock)

igneous

Granite (specifically the Ubatuba variety)

Phaneritic Igneous Rock (Granodiorite/Monzogranite)

igneous

Turquoise and Hematite

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3

mineral

Turquoise (with Hematite)

CuAl6(PO4)4(OH)8·4H2O

mineral

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

sedimentary

Hematite

Iron(III) oxide (Fe2O3)

mineral

Conglomerate

Conglomerate (clastic sedimentary rock)

sedimentary

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)

mineral

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

mineral

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

mineral

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Sandstone (Ferruginous)

Arenite (with Hematite/Limonite cement)

sedimentary

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

igneous

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

mineral

Amber

Succinite

Organic Gemstone (sedimentary associations)

Amber

Succinite (fossilized resin)

mineral

Amber

Succinite (organic hydrocarbon)

mineraloid

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Rose Quartz

Silicon Dioxide (SiO2)

mineral

Rose Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Sandstone (Pebble)

Arenite (composed primarily of SiO2)

sedimentary

Citrine

Silicon Dioxide (SiO2)

mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)

metamorphic

Citrine

Silicon dioxide (SiO2) - yellow quartz variety

mineral

Yellow Quartzite

Quartzite (SiO2 with iron oxide inclusions)

metamorphic

Rose Quartz

Rose Quartz (SiO2 - Silicon Dioxide with trace amounts of titanium, iron, or manganese)

mineral

Yellow Quartzite (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide staining

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Rhodochrosite (Beads) and Citrine (Pendant)

Rhodochrosite (MnCO3) and Quartz variety Citrine (SiO2)

mineral

Yellow Quartzite (River Pebble)

Quartzite (primarily SiO2 with iron oxide inclusions)

metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic

Granite

Phaneritic Felsic Igneous Rock (Granite)

igneous

Citrine Quartz

Silicon Dioxide (SiO2)

mineral

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

sedimentary

Yellow Jasper

Silicon Dioxide (SiO₂)

sedimentary

Red Quartzite / Ferruginous Quartz

Quartzite (primarily Silicon Dioxide, SiO2 with Iron Oxide impurities)

metamorphic

Red Coral (with Hematite and Black Pearl accents)

Corallium rubrum (Calcium Carbonate, CaCO3)

mineral

Quartz Vein in Host Rock (Gossanous Matrtix)

Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)

mineral

Iron Meteorite Fragment

Siderite (Geological term for iron meteorite class - Fe/Ni alloy)

igneous

Chert (Nodule)

Chert (SiO2)

sedimentary