Properties of Epidote
Epidote is a mineral that belongs to the silicate group, and its chemical formula is generally represented as Ca2Fe·(Al,Fe)2O(OH)(SiO4)(Si2O7). It is a green to black mineral that commonly forms elongated, prismatic crystals or can be found in granular masses.
The following table provides a comprehensive list of epidote properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Note: click on the icon to switch between Metric and Imperial units.
Physical Properties | Metric |
---|---|
Chemical Formula | Ca2Fe·(Al,Fe)2O(OH)(SiO4)(Si2O7) |
Molar Mass | 519.3 g/mol |
Crystal System | Monoclinic |
Mohs Hardness | 6 - 6.5 |
Density | 3380 - 3490 kg/m3 |
Color | Gray, apple green, brown, blue, or rose red |
Diaphaneity | Transparent to translucent |
Luster | Vitreous (glassy), resinous, pearly |
Cleavage | [001] perfect, [100] imperfect |
Fracture | Uneven |
Streak | White |
Note: unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017.