Properties of Apophyllite

Apophyllite is a mineral belonging to the family of phyllosilicates. It is typically found in volcanic rocks and is characterized by its transparent to translucent appearance and crystal formations.

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Image of apophyllite mineral
Credit: Rob Lavinsky, iRocks.com - CC-BY-SA-3.0, via Wikimedia Commons

The following table provides a comprehensive list of apophyllite properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

Note: click on the button to switch between Metric and Imperial units.

Table of Apophyllite Properties
Physical Properties
Metric
Chemical FormulaKFCa4Si8O20·8H2O
Molar Mass907.2 g/mol
Crystal SystemTetragonal
Mohs Hardness4.5 - 5
Density2350 kg/m3
ColorUsually white, colorless; also blue, green, brown, yellow, pink, violet
DiaphaneityTransparent to translucent
LusterVitreous (pearly)
CleavagePerfect on (001)
FractureUneven
StreakWhite

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.