Browse Items (5 total)

  • Title is exactly "Diabase"

Quarred for monumental stone, ophitic texture in thin section, minor amount of opaques

Ophitic texture in thin section, some opaques

Ophitic texture in thin section, plagioclase exhibits some alteration to sericite

Shows considerable fracturing, thin section examination shows ophitic texture

Holocrystalline, medium grained, anhedral, ophitic, dibastic crystals. Low silica percentage (46.3%) for a Diabase, bordering on ultramafic compostion. Calcite is present on weathered surfaces, but not on fresh surfaces. (FOV: 3.2mm)
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