Q. “Magnesium, Iron and silica are major elements of it. It is used in jewellery. It is usually a greenish crystal, often found in basaltic rocks.”
Which of the following mineral is described in the above statement?
Answer: A
Notes:
Explanation: Olivine:
- Olivine is the name of a group of rock-forming minerals that are typically found in mafic and ultramafic igneous rocks such as basalt, gabbro, dunite, diabase, and peridotite.
- They are usually green in color and have compositions that typically range between Mg2SiO4 and Fe2SiO4. Many people are familiar with olivine because it is the mineral of a very popular green gemstone known as peridot.
- Most olivine found at Earth’s surface is in dark-colored igneous rocks. It usually crystallizes in the presence of plagioclase and pyroxene to form gabbro or basalt.
- These types of rocks are most common at divergent plate boundaries and at hot spots within the centers of tectonic plates.
Source: NCERT Class 11
