Stercorite

Stercorite is the mineral form of microcosmic salt. The name comes from the Latin "stercus", meaning dung, since the mineral was originally discovered among guano.

Stercorite [1]
General
Category	Phosphate minerals
Formula	(NH4)NaHPO4
IMA symbol	Stc[2]
Strunz classification	8.CJ.05
Crystal system	Triclinic
Crystal class	Pinacoidal (1) (same H-M symbol)
Space group	P1
Identification
Formula mass	137.0077 g/mol
Mohs scale hardness	2
Luster	Vitreous
Diaphaneity	Transparent
Density	1.615 g/cm3
Melting point	79 °C (174 °F)
Fusibility	Fusible
Solubility	Water soluble