As an adjective hexagonal

is (geometry) having six edges, or having a cross-section in the form of a hexagon.

As a noun xifengite is

(mineralogy) a grey metallic hexagonal mineral.

As nouns the difference between mineral and xifengite

is that mineral is mineral while xifengite is (mineralogy) a grey metallic hexagonal mineral.

As nouns the difference between mineral and herbertsmithite

is that mineral is mineral while herbertsmithite is (mineral) a mineral with the chemical formula zncu₃(oh)₆cl₂, light green or blue-green with a vitreous lustre.

As nouns the difference between vitreous and herbertsmithite

is that vitreous is (by elision) the vitreous humor while herbertsmithite is (mineral) a mineral with the chemical formula zncu₃(oh)₆cl₂, light green or blue-green with a vitreous lustre.

As an adjective vitreous

is of or resembling glass; glassy.

As a verb lustre

is .

As an adjective lustre

is polished.

As a noun herbertsmithite is

(mineral) a mineral with the chemical formula zncu₃(oh)₆cl₂, light green or blue-green with a vitreous lustre.

As nouns the difference between manganese and bixbyite

is that manganese is manganese while bixbyite is (mineral) a rare manganese iron oxide mineral with a black metallic appearance.

As nouns the difference between iron and bixbyite

is that iron is a common, inexpensive metal, often black in color, that rusts, is attracted by magnets, and is used in making steel while bixbyite is a rare manganese iron oxide mineral with a black metallic appearance.

As an adjective iron

is made of the metal iron.

As a verb iron

is to pass an iron over (clothing or some other item made of cloth) in order to remove creases.

As nouns the difference between oxide and bixbyite

is that oxide is while bixbyite is (mineral) a rare manganese iron oxide mineral with a black metallic appearance.

As nouns the difference between metallic and boulangerite

is that metallic is a color while boulangerite is (mineral) a lead antimony sulfide mineral that forms metallic grey monoclinic crystals.

As an adjective metallic

is made of, appearing to be made of, resembling, or related to metal.

As a proper noun grey

is .

As a noun boulangerite is

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