Tantalum carbide. A transition metal carbide; Black or dark brown metallic powder, cubic crystal system, hard, insoluble in water, slightly soluble in sulfuric acid and hydrofluoric acid, and soluble in the mixed solution of hydrofluoric acid and nitric a

Tantalum carbide. A transition metal carbide; Black or dark brown metallic powder, cubic crystal system, hard, insoluble in water, slightly soluble in sulfuric acid and hydrofluoric acid, and soluble in the mixed solution of hydrofluoric acid and nitric a

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.

The chemical properties of amorphous boron are more active than crystalline boron. Crystalline boron is very hard. It is often used to replace diamonds to make cutting tools or drill bits.