Just a few minerals make up most of the rocks we see, though: feldspars, amphiboles, quartz, olivine, garnet, micas, calcite, and pyroxenes. The possible combinations of these minerals are endless.

Apart blue, green, red and yellow, any other fireworks color can be obtained by a mineral mix. For example, purple can be ...

Usually the original mineral was aragonite or calcite, and it has been replaced by silica (in ... well-cemented sediment in the middle of a relatively uncemented sedimentary rock). Indeed, the critter ...

All of Earth's rocks are built from ... One-third of mineral species formed exclusively through biological processes. ARKENSTONE/Rob Lavinsky Calcite is known to form in at least 17 different ...

A natural opening in the rock which is large enough to be entered ... The drop leaves a few crystals of the mineral calcite behind, and a stalactite begins to grow. Drop after drop, over hundreds ...

an archaeologist and rock-art specialist at Durham University told Nature. The team analysed calcite "popcorn" that had built up on the painting. Radioactive uranium in the mineral slowly decays ...

The presence of calcite veins with alteration halos signifies pathways of hydrothermal fluid flow through the host limestone ...