Rare earth mineral is the minerals which contain one or more rare elements in it. These minerals are usually found along with ingenious alkaline rocks, and these minerals are the things which tell us the difference between the Earth’s and moon’s mineral composition. The rare minerals help geologists to understand the origin of the Earth. It also help them to find the origin of life, and there are many studies that are done based on these minerals.

Rare earth minerals:

Allanite:

Allanite rock has about 20% of the rare earth elements in it, and it contains many radioactive elements. Allanite is brown to black and it falls under the Sorosilicates category. It was discovered by a mineralogist from Scotland named Thomas Allen in the year 1810.

Bastnäsite:

Bastnäsite is reddish yellow and it has cerium, yttrium, and lanthanum. Cerium is a natural bastnasite. The mineral series parasite is closely related to bastnasite, and it has rare earth fluorocarbonates and calcium. These minerals were first found in the regions such as Hungary, Greece and the Balkan regions.

Fluocerite:

Fluocerite is made up of lanthanum fluoride and cerium, and they crystallize in the trigonal system. The mineral was first described in Sweden in the year 1969.

Titanite:

Titanite is a reddish brown crystal, and it slightly has a luster. These minerals are used as a geochronometer, and it is valuable for its dispersive power.

The following are some of the categories in which the rare minerals can be classified:

Conditions in which the crystals were created:

Rare minerals are valuable as they are formed in exquisite conditions. Things which alter the mineral formation are temperature, pressure and the mineral elements. Hatrurite is made up of some of the most abundantly found minerals like calcium, oxygen, and silicon. But Hatrurite is considered as a rare mineral because it is formed at a temperature which is above 1250 degree centigrade.

Planetary constraints:

When minerals are formed by rare ingredients such as beryllium, hafnium, and tellurium then due to the composition of these rare elements the minerals are considered as rear minerals.

Ephemeral minerals:

Minerals which form under extreme and unusual conditions such as cold and dry environments. For example, the crystalline form of methane hydrate is found in Arctic drills which usually evaporates in room temperate.

The rarest gem is mentioned in the Gunnies Book of World record in the year 2005, and there are only less than 25 specimens of that crystal. It was discovered near Myanmar, and few fragments have been found near that region. Fingerite is another rare mineral which is found near the volcanic region of El Salvador, it is also made out of rare elements, and it is water soluble, so this crystal is one of the rarest minerals which satisfies all the categories.