Phenocryst
Phenocryst
Crystal larger than the rock grains that surround it in an igneous rock.
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Readers' pathsAug 2026 – Oct 2026
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Euhedral and anhedral
Well-formed crystal with easily recognizable sharp faces (and the opposite term).
30%
Porphyry (geology)
Textural form of igneous rock with large grained crystals in a fine matrix.
22%
Amygdule
Infilled gas cavity in extrusive igneous rock.
12%
Porphyroblast
Large mineral crystal in a metamorphic rock.
6.7%
Porphyritic
Igneous rock with large and small crystals.
6.2%
Feldspar
Group of rock-forming minerals.
5.7%
Plagioclase
Feldspar mineral series.
5.7%
Matrix (geology)
Finer-grained material in a rock within which coarser material is embedded.
5.7%
Ultramafic rock
Type of igneous and meta-igneous rock.
5.7%
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Porphyritic
Igneous rock with large and small crystals.
23%
Porphyry (geology)
Textural form of igneous rock with large grained crystals in a fine matrix.
19%
Rhyolite
Igneous, volcanic rock, of felsic (silica-rich) composition.
16%
Extrusive rock
Mode of igneous volcanic rock formation.
14%
Amygdule
Infilled gas cavity in extrusive igneous rock.
11%
Matrix (geology)
Finer-grained material in a rock within which coarser material is embedded.
9.7%
Tektite
Gravel-sized glass beads formed from meteorite impacts.
4.7%
Granite
Type of igneous rock.
3.6%