Here's why it's not a specific classification:
* Feldspar is incredibly common: It's one of the most abundant minerals in the Earth's crust. Therefore, many rocks contain feldspar as a component.
* Many rock types can be feldspathic: Granite, syenite, diorite, gabbro, and even some sedimentary rocks like sandstone and arkose can be considered feldspathic.
What does "feldspathic" tell us about a rock?
* It likely contains a high proportion of feldspar minerals. This implies the rock may have formed in specific environments or conditions where feldspar is abundant.
* It's not a precise term: It doesn't tell us much about the other minerals present or the rock's texture.
Examples of feldspathic rocks:
* Granite: A coarse-grained igneous rock with a high proportion of quartz and feldspar.
* Arkose: A sandstone with a significant amount of feldspar grains.
* Diorite: An igneous rock with a mix of feldspar and pyroxene.
In summary, "feldspathic rock" is a general term indicating the presence of feldspar, which is common in many rock types. To be more specific, you would need to describe the rock further based on its other mineral constituents and texture.
