Man Made Rock Like Material

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)

Diabase (Greenstone)

Diabase (Dolerite)

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Sandstone

Arenite (composed primarily of SiO2)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Vesicular Basalt (Scoria)

Basalt (Extrusive Igneous Rock)

Sandstone

Arenite (primarily SiO2)

Chert (often called Flint or Jasper)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Petrified Wood

Silicified Wood (SiO2)

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

Shale

Fissile Mudstone

Chert (Pink Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Vesicular Basalt (Amygdaloidal)

Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)

Synthetic Costume Accessory (Non-Geological)

Polyester and Acrylic Fiber (Anthropogenic polymer)

River Quartzite (River Rock)

Quartzite (SiO2)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Flowerstone

Porphyritic Basalt or Porphyritic Andesite

Quartzite

Quartzite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Diabase

Diabase (also known as Dolerite)

Sandstone Pebble

Arenite (primarily Quartz, SiO2)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with FeO(OH) impurities)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (with Hematite/Limonite cement)

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz