Aragonite is the least stable form; crystals have been found altered to calcite.
The rauchstein of the modern section is distinguished by stringers of calcite, which give it at times a brecciated appearance.
It was not common carbonate of lime, for the crystals were rhombohedral and did not show the cleavage of calcite.
Thus calc spar is a common name for calcite, heavy spar for barite, needle spar for aragonite, and so on.
Their bright light showed the night reticulated with thin lines of smoke, like veins of calcite in a canopy of black marble.
calcite cleaves in three directions parallel to the faces of the primitive rhombohedron.
A vase of calcite, also dedicated by Entemena, has been found at Nippur.
The secondary twin-lamination, parallel to the obtuse rhombohedron e , so common in calcite, does not exist in dolomite.
This is decomposed, leaving a yellow stain of ferric hydrate where the calcite occurred.
The distribution of the calcite may be rendered more clear by using ferric chloride solution.