tourmaline

As a pronoun en

is he, him.

As a noun tourmaline is

a complex black or dark coloured borosilicate mineral.

As a noun tourmaline

is a complex black or dark coloured borosilicate mineral.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between tourmaline and aquamarine

is that tourmaline is a complex black or dark coloured borosilicate mineral while aquamarine is .

As nouns the difference between apatite and tourmaline

is that apatite is a calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer while tourmaline is a complex black or dark coloured borosilicate mineral.

As nouns the difference between epidote and tourmaline

is that epidote is any of a class of mixed calcium iron aluminium sorosilicates found in metamorphic rocks while tourmaline is a complex black or dark coloured borosilicate mineral.

As nouns the difference between ametrine and tourmaline

is that ametrine is ametrine while tourmaline is a complex black or dark coloured borosilicate mineral.

As nouns the difference between granite and tourmaline

is that granite is granita (sorbet) while tourmaline is a complex black or dark coloured borosilicate mineral.

As a verb granite

is .

As nouns the difference between tourmaline and biotite

is that tourmaline is a complex black or dark coloured borosilicate mineral while biotite is a dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.

As nouns the difference between lepidolite and tourmaline

is that lepidolite is lepidolite while tourmaline is a complex black or dark coloured borosilicate mineral.

As nouns the difference between citrine and tourmaline

is that citrine is a goldish-yellow colour, like that of a lemon while tourmaline is a complex black or dark coloured borosilicate mineral.

As an adjective citrine

is of a goldish-yellow colour.