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For example, olivine may form the primary phenocrysts of some materials, and as such is used to define the subtype of that material (e.g.

Phenocrysts is described in multiple online sources, as addition to our editors' articles, see section below for printable documents, Phenocrysts books and related discussion.

Suggested Pdf Resources

Analcime phenocrysts in igneous rocks: Primary or secondary
American Mineralogist, Volume 78, pages 225-229, 1993. Analcime phenocrysts in igneous rocks: Primary or secondary?-Discussion.
Calcic cores of plagioclase phenocrysts in andesite from Karymsky
Origin of broken phenocrysts in ash-flow tuffs
Melt Inclusions in Olivine Phenocrysts: Using Diffusive Re
that large unzoned cores of high-Fo phenocrysts cannot reflect diffusive phenocrysts.

Suggested News Resources

Silver Spruce Reports More Significant REE Results Pope's Hill Trend, Trans
The mineralized unit, a syenite to monzonite, a minimum of 10 metres wide, carries green pyroxene crystals as phenocrysts up to 5 cm long, and is open along strike to both the east and west.

Suggested Web Resources

Phenocryst - Wikipedia, the free encyclopedia
A phenocryst is a relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of a porphyritic igneous rock.
Large crystals, or phenocrysts, of feldspar in a basalt flow.
Phenocrysts - definition of Phenocrysts by the Free Online Dictionary
A conspicuous, usually large, crystal embedded in porphyritic igneous rock. [ pheno- + cryst(al).] phe no·crys tic adj.
Geology: phenocryst
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