2010-02-01
Obsidian – a glassy phase of lava.
Onyx marble – A dense, crystalline form of lime carbonate deposited usually from cold-water solutions. Generally translucent and showing a characteristic layering due to mode of accumulation.
Oolitic countertop – A calcite-cemented calcareous china granite formed of shells and shell fragments, practically non-crystalline in character. It is found in massive deposits located almost entirely in Lawrence, Monroe, and Owen Counties, IN, and Alabama, Kansas, and Texas. This limestone is characteristically freestone, without cleavage planes, possessing a remarkable uniformity of composition, texture and structure. It possesses a high internal elasticity, adapting itself without damage to extreme temperature changes.
Opalized – The introduction into a rock of siliceous material in the form of opal, hydrous silicate.
Out of wind – The be out of wind is to have the arris of the stone not in parallel or perpendicular lines. Stone that is out of wind has an irregular or rustic appearance.
