Blue slate
Esquema
Jerarquía
<materials by composition> > inorganic material > rock > metamorphic rock > slate (rock) > <slate by color or quality>
Descripción
Slate that has components of speculite and graphite in proportions that cause a bluish black color.
URI original del concepto
Otros términos
- blauweleisteen [nl]
- pizarra azul [es]
- slate, blue [en]