Feldspathoid minerals are a group of tectosilicate minerals that resemble feldspar but have a different structure and a much lower silica content. They occur in rare and unusual magmatic rocks and are not found in rocks containing primary quartz.
15 Naturally Striped and Banded Rocks
Some rocks in nature display remarkable patterns of stripes, wavy bands, and contrasting layers, almost as if they had been painted by an artist....
Rocks That Float on Water: Types, Formation, and Examples
When you drop a rock into water, you usually expect it to sink. Most rocks are denser than water, so they quickly settle to...
Why Is My Rock Magnetic? 8 Common Magnetic Rocks and Minerals
When you bring a magnet close to a rock and notice that it is strongly attracted, the result can be surprising. If the rock...