Mineral Like Byproduct (Technogenic)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Amethyst (Tumbled Chips)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

igneous

Native Copper with Malachite and Chrysocolla

Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Satin Spar Selenite

Gypsum (CaSO4·2H2O)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Chalcedony (specifically Agate or Carnelian variety)

Cryptocrystalline Silica (SiO2)

Fulgurite

Fulgurite (Lechatelierite-rich variety)

metamorphic

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Dyed Howlite

Borosilicate hydroxide (Ca2B5SiO9(OH)5)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Pyrite

Iron Disulfide (FeS2)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Fe/Mn/Mg)

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Glauconite (Glauconitic Sandstone)

Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.