Cheralite is an anhydrous

phosphate mineral Phosphate minerals contain the tetrahedrally coordinated phosphate (PO43−) anion along sometimes with arsenate (AsO43−) and vanadate (VO43−) substitutions, and chloride (Cl−), fluoride (F−), and hydroxide (OH−) anions that also fit i ...

with the ideal chemical formula CaTh(PO₄)₂.Cheralite on Mindat.org
/ref> It is isomorphous with

huttonite Huttonite is a thorium nesosilicate mineral with the chemical formula and which crystallizes in the monoclinic system. It is dimorphous with tetragonal thorite, and isostructual with monazite. An uncommon mineral, huttonite forms transparent or ...

and monazite. It can be regarded as the product of the complete cationic substitution in the system: 2 LREE³⁺ ↔ Ca²⁺ + Th⁴⁺. It was previously known under the name brabantite. Physical properties: {, class="wikitable" , + !Property !Value , - , Lustre , Vitreous , - , Description , Dull or greasy , - , Colour , Grayish brown to reddish brown (on rims), pale yellow, brownish green , - , Hardness , 5 on Mohs scale , - , Density , 4.72 - 5.02 g/cm³

References

Thorium minerals Phosphate minerals