anhydrite

As nouns the difference between anhydrite and chalk

is that anhydrite is (mineral) a saline evaporite consisting of anhydrous calcium sulfate (gypsum) while chalk is (uncountable) a soft, white, powdery limestone.

As a verb chalk is

to apply chalk to anything, such as the tip of a billiard cue.

As a noun anhydrite

is (mineral) a saline evaporite consisting of anhydrous calcium sulfate (gypsum).

As an adjective undefined is

lacking a definition or value.

is likely misspelled.

has no English definition.

As a noun anhydrite

is a saline evaporite consisting of anhydrous calcium sulfate (gypsum).

As nouns the difference between anhydrite and anhydride

is that anhydrite is a saline evaporite consisting of anhydrous calcium sulfate (gypsum) while anhydride is any compound formally derived from another (or from others) by the loss of a water molecule, especially acid anhydrides.

As nouns the difference between anhydrate and anhydrite

is that anhydrate is an acid anhydride while anhydrite is a saline evaporite consisting of anhydrous calcium sulfate (gypsum).

As a verb anhydrate

is to dehydrate, especially in food processing.

As nouns the difference between anhydrite and vulpinite

is that anhydrite is (mineral) a saline evaporite consisting of anhydrous calcium sulfate (gypsum) while vulpinite is (mineralogy) a scaly granular variety of anhydrite of a grayish-white colour, used for ornamental purposes.

As nouns the difference between anhydrite and karstenite

is that anhydrite is (mineral) a saline evaporite consisting of anhydrous calcium sulfate (gypsum) while karstenite is (mineralogy|archaic) anhydrite.