Mineral Of The Day #157: Wollastonite
Mohs Hardness Scale: 4.5-5
Category: Inosilicate mineral
- Wollastonite was named after the English chemist and mineralogist William Hyde Wollaston (1766-1828).
- It has high brightness and whiteness, low moisture and oil absorption, and low volatile content.
- Wollastonite is used in ceramics, friction products (brakes and clutches), metalmaking, paint filler, and plastics.
Mineral Of The Day #139: Augite
Mohs Hardness Scale: 5-6.5
Category: inosilicate mineral, pyroxene group
- Augite is an important rock-forming mineral. It is found in igneous rocks and high-temperature metamorphic rocks.
- Occasional augite specimens have a shiny appearance that give rise to the mineral’s name, which is from the Greek augites, meaning “brightness.” Ordinary specimens have a dull (dark green, brown, or black) finish.
Mineral Of The Day #91: Rhodonite
Mohs Hardness Scale: 5.5-6.5
Category: inosilicate mineral
- Rhodonite’s name comes from the Greek word rhodos which means “rosy.”
- It is used as an ornamental stone and in jewelry.
- Rhodonite often has black manganese oxide veins running through a specimen, giving it a distinct appearance.
- It is the official gem of the Commonwealth of Massachusetts.
- Crystal healers call it a “rescue stone” that raises self worth and wards off negativity.