Mineral On Igneous Rock

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Basalt with Calcite Veins

Basalt (Mafic Volcanic Rock)

Basalt

Basalt (Mafic volcanic rock)

Diorite

Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)

Granite

Granite (a plutonic igneous rock composed primarily of quartz and feldspar)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Peridotite (Pyroxenite/Serpentinized Dunite)

Ultramafic Rock (consisting primarily of Olivine and Pyroxene)

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.

Diorite

Phaneritic Intermediate Plutonic Rock (Diorite)

Basalt with Olivine Phenocrysts

Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Basalt River Pebble

Extrusive mafic igneous rock; primarily composed of Plagioclase Feldspar and Pyroxene

Granodiorite (Gneissic Pebble)

Granodiorite displaying minor foliation

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Not a geological specimen

N/A (man-made object)

Granite

Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)

Amygdaloidal Basalt with Quartz/Zeolite Infill

Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)

Geodude

Geodude (Rock Pokémon: No. 74)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Granite (Weathered/Oxidized)

Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Indigo Gabbro (also known as Mystic Merlinite)

Gabbro (composed of Plagioclase Feldspar, Pyroxene, and minor Magnetite/Ilmenite)

Vesicular Basalt (Amygdaloidal)

Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)

Granodiorite (River Rock / Cobble)

Granodiorite; Phaneritic intrusive igneous rock dominated by plagioclase, quartz, and hornblende/biotite

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Crushed Stone (Likely Granite or Diabase)

Intrusive Igneous Rock (Granitoid/Gabbroid)

Basalt (River Stone)

Basalt (Mafic Extrusive Igneous Rock)

Unakite

Epidotized Granite

Basalt with Magnetite inclusions

Basalt (Mafic silicate rock) potentially containing Magnetite (Fe3O4)

Graphite

Graphite (Carbon, C)

Basalt River Stone (Tumbled)

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (Mafic Aphanitic Igneous Rock)

Granite Pebble

Granite (Phaneritic Acidic Igneous Rock)

Basalt Column Section

Columnar Basalt (Mafic Extrusive Igneous Rock)

Pumice

Pumice (a highly vesicular extrusive igneous rock)