Of these the most important is the great oval mass of granite in the North, composed of two varieties; one, coarse-grained and older, forms the outside rim, while the fine-grained and newer type occurs in the interior.
The sand should be coarse-grained and hard.
At first it becomes more coarse-grained, like the Firn Schnee of the Alps, and is moist by melting during the summer.
The coarse-grained grey Rumanian caviare is forwarded to Berlin, and there blended with Russian caviare.
They vary in texture from a fine-grained compact oolite to a coarse-grained rock composed of angular or rounded fragments, and they commonly exhibit strongly marked false bedding.