xonaltite

As a noun xonaltite is

(mineralogy|rare) a hydrous silicate of calcium, occurring in massive form of a white or bluish‐gray colour.

Xonotlite is a synonym of xonaltite.

As nouns the difference between xonotlite and xonaltite

is that xonotlite is (mineralogy) a mineral with the chemical formula ca₆si₆o₁₇(oh)₂, found in various colours while xonaltite is (mineralogy|rare) a hydrous silicate of calcium, occurring in massive form of a white or bluish‐gray colour.

As nouns the difference between calcium and xonaltite

is that calcium is a chemical element, atomic number 20, that is an alkaline earth metal and occurs naturally as carbonate in limestone and as silicate in many rocks while xonaltite is a hydrous silicate of calcium, occurring in massive form of a white or bluish‐gray colour.

As nouns the difference between silicate and xonaltite

is that silicate is while xonaltite is (mineralogy|rare) a hydrous silicate of calcium, occurring in massive form of a white or bluish‐gray colour.

Hydrous is likely misspelled.

Hydrous has no English definition.

As a noun xonaltite is

a hydrous silicate of calcium, occurring in massive form of a white or bluish‐gray colour.