Compounds of the crandallite type comprise a natural mineral group reaching from proper crandallite CaAl 3(OH) 6(HPO 4)(PO 4) over woodhouseite CaAl 3(OH) 6(SO 4)(PO 4) to alunite KAl 3(OH) 6(SO 4) 2.
纤磷钙铝石类化合物系由自纤磷钙铝石CaAl3 (OH) 6(HPO4) (PO4)本身、经磷钙铝石CaAl3 (OH) 6(SO4) (PO4)到钾明矾石KAl3 (OH ) 6(SO4) 2 等的天然矿物族所组成的。
It is believed that palermoite-bertossaite is a perfect Sr-Ca isomorphic series with achemical formula of Li_2(Sr,Ca)Al_4[PO_4]_4(OH)_4.
柱磷锶锂矿与磷铝钙锂石是一完全类质同象系列(Sr、Ca)的两个端元矿物,二者在自然界都十分罕见,仅少量产于花岗伟晶岩中,所报道的产地也廖廖无几。