Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
Category
Browse sedimentary (mineraloid specimens identified by the Rock Identifier community.
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
Precious Coral
Corallium rubrum (Calcium carbonate with trace carotene)
Green Opal
Hydrated Silica (SiO2·nH2O)
Amber
Succinite (Organic Mineraloid)
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
Amber in Matrix
Succinite (Carbon-based organic polymer)
Opal
Hydrated Silica (SiO2·nH2O)
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
Precious Opal
Hydrated Silica (SiO2·nH2O)
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
Jet
Lignite (Anthracite-grade compact coal)
Amber
Succinite (Organic Mineraloid) - C10H16O
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
Opal
Hydrated Silica (SiO2·nH2O)
Amber
Succiniferous fossil resin (C10H16O)
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
Amber
Amber (C10H16O)
Amber
Succinate (Fossilized Tree Resin)
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Opal
Hydrated amorphous silica (SiO2·nH2O)
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
White Precious Opal
Hydrated Silica (SiO2·nH2O)
Amber
Succinicum (Formula: C10H16O)
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Amber
Succinite
Amber
Succinite (Resinous fossilized tree sap)
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
Black Opal
Hydrated silica (SiO2·nH2O)
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Opal
Hydrated silica (SiO2·nH2O)
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O