Obsidian does not follow the traditional color rule with igneous rocks because it is dark colored and felsic.

Here's why:

1. Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is a type of volcanic glass.

2. The color of an igneous rock can generally give us a clue about the rock's mineral composition. Dark-colored igneous rocks are typically mafic, meaning they're rich in magnesium and iron, while light-colored igneous rocks are typically felsic, meaning they're rich in silicon and aluminum.

3. However, obsidian is an exception to this rule. Despite being dark-colored, it is felsic. This is because obsidian is over 70% silica, which is a characteristic of felsic rocks. The dark color is due to small amounts of impurities such as iron and magnesium.

4. Therefore, obsidian is dark colored and felsic, which makes it an exception to the traditional color rule with igneous rocks.

Question

Obsidian does not follow the traditional color rule with igneous rocks because it is dark colored and felsic.

Here's why:

1. Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is a type of volcanic glass.

2. The color of an igneous rock can generally give us a clue about the rock's mineral composition. Dark-colored igneous rocks are typically mafic, meaning they're rich in magnesium and iron, while light-colored igneous rocks are typically felsic, meaning they're rich in silicon and aluminum.

3. However, obsidian is an exception to this rule. Despite being dark-colored, it is felsic. This is because obsidian is over 70% silica, which is a characteristic of felsic rocks. The dark color is due to small amounts of impurities such as iron and magnesium.

4. Therefore, obsidian is dark colored and felsic, which makes it an exception to the traditional color rule with igneous rocks.

Knowee AI · Accepted Answer

Obsidian does not follow the traditional color rule with igneous rocks because it is dark colored and felsic.

Here's why:

1. Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. It is a type of volcanic glass.

2. The color of an igneous rock can generally give us a clue about the rock's mineral composition. Dark-colored igneous rocks are typically mafic, meaning they're rich in magnesium and iron, while light-colored igneous rocks are typically felsic, meaning they're rich in silicon and aluminum.

3. However, obsidian is an exception to this rule. Despite being dark-colored, it is felsic. This is because obsidian is over 70% silica, which is a characteristic of felsic rocks. The dark color is due to small amounts of impurities such as iron and magnesium.

4. Therefore, obsidian is dark colored and felsic, which makes it an exception to the traditional color rule with igneous rocks.

Obsidian doesn't follow the traditional color rule with igneous rocks because it islight colored and felsicdark colored and maficdark colored and felsiclight colored and mafic

Question

Solution

Similar Questions

Upgrade your grade with Knowee