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Title is exactly "Diabase"
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Diabase
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)
Diabase
Shows considerable fracturing, thin section examination shows ophitic texture
Diabase
Ophitic texture in thin section, plagioclase exhibits some alteration to sericite
Diabase
Ophitic texture in thin section, some opaques
Diabase
Quarred for monumental stone, ophitic texture in thin section, minor amount of opaques
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