Red Sandstone
Arenite (Fe2O3 rich)
Category
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Red Sandstone
Arenite (Fe2O3 rich)
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Diamond
Diamond (pure Carbon, C)
Sandstone (specifically Red Sandstone)
Arenite (SiO2 with Iron Oxide)
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
Siltstone
Siltstone (primarily composed of SiO2 with various clay minerals)
Diamond
C (Carbon)
Mother of Pearl and Onyx
Aragonite (Mother of Pearl) and Chalcedony (Onyx)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Quartz Geode
Silicon Dioxide (SiO2) within a geode
Petrified Wood
Silicified Wood (primarily SiO2)
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
Chondrite Meteorite
Ordinary Chondrite (L or H Type)
Sandstone (with Iron Oxide)
Arenite with Limonite/Hematite staining
Zebra Jasper
Tumbled Opaque Chalcedony (SiO2)
Diorite (River Cobble)
Intermediate plutonic igneous rock
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
Milky Quartz
Silicon Dioxide (SiO2)
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
Quartzite
Quartzite (primarily SiO2)
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
Diamond (Princess Cut)
Carbon (C)
Chondrite Meteorite
Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
Coquina / Shelly Limestone
Coquina (calcium carbonate, CaCO3)
Petrified Wood
Silicified Wood (SiO2)
Plagioclase Feldspar
NaAlSi3O8 – CaAlSi2O8 (Sodium-Calcium Aluminum Silicates)
Pyrite
Iron Sulfide (FeS2)
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
White Quartz Pebble
Silicon Dioxide (SiO2)
Olivine (often within Peridotite)
Magnesium iron silicate, (Mg,Fe)2SiO4
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
Sandstone
Sandstone (clastic sedimentary rock)
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
Given the appearance, it's likely a fragment of an igneous or metamorphic rock composed of multiple minerals. Without specific diagnostic features, it's difficult to give a common name other than 'crystalline rock fragment'. If pressed to guess based on the granular, somewhat light and dark speckled appearance, it could be a fragment of granite or a related intrusive igneous rock.
As a rock fragment, it does not have a single scientific mineral name; rather, it's a piece of a rock which is a combination of minerals. If it were granite, its main mineral composition would be quartz (SiO2), feldspar (e.g., KAlSi3O8 - orthoclase, (Na,Ca)(Al,Si)4O8 - plagioclase), and mica (e.g., KAl2(AlSi3O10)(OH)2 - muscovite or K(Mg,Fe)3AlSi3O10(OH)2 - biotite), among others.
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Red Sandstone
Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)