Dana Classif. :	Dana Code	:	29.6.3.1
	Dana Class	:	29 - Hydrated Acid and Sulfates
	Dana Type	:	29.6 - Hydrated Acid and Sulfates where A XO4 • x(H2O)
	Dana Group	:	29.6.3 -
	Code	Mineral		Formula	H-M Symbol	Space Group
	29.6.3.1	Gypsum		CaSO4·2(H2O)	2/m	A2/a
Strunz Classif. :	Strunz Code	:	VI/C.22-20
	Strunz Class	:	VI - Sulfates, Chromates, Molybdates and Tungstates
	Strunz Type	:	VI/C - VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size
	Strunz Group	:	VI/C.22 - Bassanite - Ardealite series
	Code	Mineral		Formula	H-M Symbol	Space Group
	VI/C.22-10	Bassanite		2CaSO4·(H2O)		Unk
	VI/C.22-20	Gypsum		CaSO4·2(H2O)	2/m	A2/a
	VI/C.22-25	Rapidcreekite		Ca2(SO4)(CO3)·4(H2O)	2/m 2/m 2/m	Pcnb
	VI/C.22-30	Ardealite		Ca2(SO4)(HPO4)·4(H2O)	m	Cc