Here's why:
* Interlocking crystals: Granite is an igneous rock that forms when magma cools slowly underground. This slow cooling allows crystals to grow large and interlock with each other.
* Mainly white: The white color in granite is typically due to the presence of quartz and feldspar minerals. These are common minerals in granite, and they are often white or light-colored.
Other possibilities:
While granite is the most common, there are other rocks that could fit your description:
* Quartzite: A metamorphic rock formed from sandstone. It can have interlocking quartz crystals and be mostly white.
* Marble: A metamorphic rock formed from limestone. It can be white, but the crystals might not be as obviously interlocking as in granite.
To determine the exact type of rock, you would need to:
* Examine the rock more closely: Look for other minerals present, like mica or hornblende, which can help identify the specific rock type.
* Consider the location: Where did you find the rock? Its geological context can provide clues about its origin.
Let me know if you have any other details about the rock, and I can help narrow it down further.
