Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Quartz Vein in Gneiss or Basalt
Milky Quartz (SiO2) within Metamorphic Host Rock
Metamorphic or Igneous with Mineral Inclusion
Agate (specifically Carnelian Agate or Lake Superior style Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Argetine Blue Agate (Chalcendony variant)
Silicon Dioxide (SiO₂)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Yellow Quartz (Citrine or Yellow Jasper)
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Limonite (Iron Ore/Bog Iron)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz with Chalcedony
Silicon dioxide (SiO2)
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Fe2O3 (Hematite) inclusions
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Milky Quartz (Druzy Geode fragment)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)
Sedimentary Rock
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Agate Geode
Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals
mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2
mineral
Sandstone
Arenite
sedimentary