Lapis lazuli is a non-foliated metamorphic rock. “Lapis” as it is commonly called, consists of a few different minerals throughout the rock, with no distinct foliation. Lapis lazuli is more commonly found in limestone...
Chert is a sedimentary rock that is typically found in nodules in surrounding limestone. Chert rock is mainly comprised of microcrystalline crystals of quartz. There are some formations of chert rock that can be...
The differences between rocks and minerals are that a mineral is a natural occurring solid chemical compound which is formed as a crystalline structure. Rocks are formed of naturally occurring solid masses that typically...
A rock cycle diagram shows how the three main rock types—sedimentary, metamorphic, and igneous—form and transform through processes such as weathering, erosion, heat, pressure, melting, and cooling. The rock cycle is not a strict...
Hematite is a common iron oxide mineral found in rocks and soils everywhere. Hematite is commonly seen in two different forms called metallic hematite and earthy hematite. Hematite can come in a variety of...
What is Variscite? Variscite is a mineral composed of hydrated aluminum phosphate. This mineral will occur as nodules, veins, and fine grained masses. Variscite can also occur as an uncommon fine-grained sparkly crust on...
What Type of Rock is Sandstone Sandstone is a type of sedimentary rock. It is considered to be clastic, meaning it is made up of preexisting rocks and minerals such as sand particles. Sandstone...
Emerald is a precious gemstone that is part of the beryl group. Emeralds are found in all types of rocks and has been a popular and desirable mineral for thousands of years. Being so...
Rhyolite is an extrusive igneous rock and is high in silica content. This fine grained igneous rock will typically contain the minerals quartz, plagioclase, and sanidine with lesser amounts of biotite and hornblende. Rhyolite...
What is Cinnabar? Cinnabar is a mercury sulfide that is formed by being deposited into surrounding rock veins by hydrothermal circulation of water near recent volcanic activity. Cinnabar is found as massive, granular, or...