[1][2] In fossil and mineral collecting, geologist's hammers are used to break rocks in order to reveal specimens contained within.

[3] The effective power of a geologist's hammer is mainly considered to be a reflection of its head weight and handle length.

Head weight may range from 8 oz (230 g) or less on a small hammer—such as would generally be used for casual use or by children—to 4 lb (1.8 kg) and greater.

[3] The best geologist's hammers are forged from one piece of hardened steel, which renders them sturdy and long-lasting.

Such alternative handles sacrifice strength and make the hammer unsuitable for high-strain activities such as prying.