As a proper noun grey

is .

As a noun boulangerite is

(mineral) a lead antimony sulfide mineral that forms metallic grey monoclinic crystals.

As an adjective monoclinic

is (crystallography) having three unequal axes with two perpendicular and one oblique intersections.

As a noun boulangerite is

(mineral) a lead antimony sulfide mineral that forms metallic grey monoclinic crystals.

As a proper noun crystal

is .

As a noun boulangerite is

(mineral) a lead antimony sulfide mineral that forms metallic grey monoclinic crystals.

As nouns the difference between fluoride and carobbiite

is that fluoride is while carobbiite is (mineral) potassium fluoride, a rare, soft, colourless cubic mineral.

As an adjective colourless

is having little or no colour.

As a noun carobbiite is

(mineral) potassium fluoride, a rare, soft, colourless cubic mineral.

As nouns the difference between cubic and carobbiite

is that cubic is a cubic curve while carobbiite is potassium fluoride, a rare, soft, colourless cubic mineral.

As an adjective cubic

is used in the names of units of volume formed by multiplying a unit of length by itself twice.

As nouns the difference between mineral and carobbiite

is that mineral is mineral while carobbiite is (mineral) potassium fluoride, a rare, soft, colourless cubic mineral.

As nouns the difference between phosphate and xanthiosite

is that phosphate is while xanthiosite is (mineralogy) a phosphate mineral first discovered in germany in 1858.

As nouns the difference between mineral and xanthiosite

is that mineral is mineral while xanthiosite is (mineralogy) a phosphate mineral first discovered in germany in 1858.

As nouns the difference between silicate and dumortierite

is that silicate is while dumortierite is (mineral) a fibrous aluminium boro-silicate mineral that occurs in various colours.