Cheralite is an anhydrous

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

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

isomorphous In mathematics, an isomorphism is a structure-preserving mapping or morphism between two structures of the same type that can be reversed by an inverse mapping. Two mathematical structures are isomorphic if an isomorphism exists between them. ...

with huttonite and

monazite Monazite is a primarily reddish-brown phosphate mineral that contains rare-earth elements. Due to variability in composition, monazite is considered a group of minerals. The most common species of the group is monazite-(Ce), that is, the cerium ...

. 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