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Terminology index:
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XYZ
O
obsidian a glassy phase of lava.
ogee a stone profile with a reverse curved edge: concave above, convex below.
onyx marble a dense, crystalline form of lime carbonate deposited usually from cold water solutions. Generally translucent and shows a characteristic layering due to mode of accumulation.
oolitic limestone a calcite-cemented calcareous stone 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 in Alabama, Kansas, and Texas. This limestone is characteristically a 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 to be out of wind is to have the arris of the stone not in parallel or perpendicular lines. Stone which is out of wind has an irregular or rustic appearance.
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