Magnetite
Magnetite (Fe3O4)
Category
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
Magnetite
Magnetite (Fe3O4)
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
Quartz
Quartz (SiO2 - Silicon Dioxide)
Geode (Quartz)
Silicon Dioxide (SiO2)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Basalt (Vesicular)
Vesicular Basalt
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
Jasper with Quartz Druzy
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Granite
Granite
Smoky Quartz
Silicon dioxide (SiO2)
Jasper
Jasper (Silicon Dioxide, SiO2)
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Rose Quartz Druzy
Silicon Dioxide (SiO2)
Banded Calcite
Calcite (Calcium Carbonate - CaCO3)
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
Raw Citrine
Citrine (Silicon Dioxide - SiO2)
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Sandstone
Arenite (SiO2 principal)
Chert (and Limestone)
Chert (consisting of Microcrystalline Quartz, SiO2)
Jadeite
Jadeite (NaAlSi2O6)
Carnelian
Chalcedony (SiO2) with iron oxide impurities
Rough Ruby (Corundum) in Zoisite Matrix
Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Quartz
SiO₂ (Silicon Dioxide)
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Marble
Recrystallized Calcite / Dolomite (CaCO3)
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Conglomerate (River Rock)
Clastic sedimentary rock (primarily SiO2)
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.