Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Category
Metamorphic
Browse metamorphic specimens identified by the Rock Identifier community.
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Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
mineral
Epidote
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Brecciated Quartzite
Brecciated Quartzite
Metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 containing Fuchsite)
metamorphic
Yellow Aventurine
Quartzite (formula: SiO2 with inclusions)
metamorphic
Fuchsite in Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) containing Chromium + Quartz (SiO2)
metamorphic
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Graphite
Graphite (Carbon, C)
metamorphic
Unakite
Unakite (Altered Granite)
metamorphic
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
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.
Mineral, possibly rock fragment containing a mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Epidosite (Epidote-rich rock)
Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Mica Schist
Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)
metamorphic
Greenschist with Quartz Veining
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gneiss (specifically Amphibolite Gneiss)
Gneiss
metamorphic
Phyllite
Phyllite (regional metamorphic rock)
metamorphic
Quartzite with Hematite staining
Metamorphic Rock (rich in SiO2)
metamorphic
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Quartzite with Chlorite
Metamorphic Quartzite (SiO2) with phyllosilicates
metamorphic
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic silicate rock)
metamorphic
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
River Stone (Quartzite)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Gneiss
Metamorphic Rock (Gneissic texture)
metamorphic