As an adjective tetragonal

is having four sides (as a tetragon); quadrilateral.

As a noun abswurmbachite is

a tetragonal copper manganese silicate mineral with a metallic lustre.

As nouns the difference between copper and abswurmbachite

is that copper is a reddish-brown, malleable, ductile metallic element with high electrical and thermal conductivity, symbol Cu, and atomic number 29 while abswurmbachite is a tetragonal copper manganese silicate mineral with a metallic lustre.

As an adjective copper

is made of copper.

As a verb copper

is to sheathe or coat with copper.

As nouns the difference between manganese and abswurmbachite

is that manganese is manganese while abswurmbachite is (mineral) a tetragonal copper manganese silicate mineral with a metallic lustre.

As nouns the difference between silicate and abswurmbachite

is that silicate is while abswurmbachite is (mineral) a tetragonal copper manganese silicate mineral with a metallic lustre.

As nouns the difference between mineral and abswurmbachite

is that mineral is mineral while abswurmbachite is (mineral) a tetragonal copper manganese silicate mineral with a metallic lustre.

As nouns the difference between metallic and abswurmbachite

is that metallic is a metallic color while abswurmbachite is a tetragonal copper manganese silicate mineral with a metallic lustre.

As an adjective metallic

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

As nouns the difference between borax and searlesite

is that borax is borax while searlesite is (mineralogy) a sodium borosilicate mineral, an important ore of borax.

As an adjective hydrous

is (chemistry) containing combined water; hydrated.

As a noun abernathyite is

(mineral) a rare hydrous uranium oxide mineral that forms yellow vitreous tabular crystals with perfect cleavage.

As nouns the difference between uranium and abernathyite

is that uranium is the element with atomic number 92 and symbol u while abernathyite is (mineral) a rare hydrous uranium oxide mineral that forms yellow vitreous tabular crystals with perfect cleavage.

As nouns the difference between oxide and abernathyite

is that oxide is while abernathyite is (mineral) a rare hydrous uranium oxide mineral that forms yellow vitreous tabular crystals with perfect cleavage.