a. Acidic rock, containing a lot of salicylic acid is a silicon compound
and oxide, containing whitish colored quartz.
b. Alkaline rocks, low salicylic acid levels contain lots of magnesium
and iron, the color is dark / blackThe process of formation This rock is formed from the result of freezing of the magma in the composition of acid that freezes in the magma chamber, so this stone is a type of deep frozen stone.Specific mass: around 2.2 - 2.3 grams / cm3
Color: white, gray, or a mixture of both.These rocks are found in many coastal areas and on the banks of large rivers or on river beds.This rock can be used as a basic material for making:1. Stone building materials2. Monument3. Bridge4. As a decoration5. Tile material6. and others