Porphyry
Esquema
Jerarquía
<materials by composition> > inorganic material > rock > igneous rock > <igneous rock by composition> > <igneous rock by composition: physical>
Descripción
A dark purplish-red rock, first quarried in ancient Egypt, containing relatively large crystals in a fine-grained igneous matrix. One of the hardest rocks, it takes a high polish and is valued as a durable sculptor's material and as a decorative architectural material. It is considered the best material for the muller and slab used for grinding artists' colors.
Subcategorías
URI original del concepto
Otros términos
- porfier [nl]
- pórfido [es]
- lapis porphyrite [en]