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238:, they are employed to break rocks with the aim of revealing specimens inside. Geologist's hammers are also sometimes used for scale in a photograph. The hammer also serves as an extension of the senses, permitting the geologist to perceive the rock's granularity, soundness, and resistance to fracturing that may be relevant to its use or identification. A geologist's hammer is often used with a chisel.
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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. A
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head (pictured) is useful for clearing loose material and vegetation from exposures, or creating exposures through digging. It is sometimes (at risk of damage) used to pry open fissures. Some rocks can be easily split, like slate or shale, to reveal any
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A pick head, which terminates in a sharp point to deliver maximum pressure, is often preferred for harder rocks. A geologist's hammer bearing a pick end is often referred to as a rock pick, geological pick, or prospecting pick instead of a geologist's
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Geologist's hammers, as with most hammers, have two heads, one on either side. Most commonly, the tool consists of a flat square head on one end, with either a chisel or a pick head at the other end.
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A corner or edge of the flat head is used to deliver a blow to a rock with the intention of splitting it. Specimens or samples can be trimmed to remove sharp corners or reduce them in size.
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used for splitting and breaking rocks. In field geology, they are used to obtain a fresh surface of a rock to determine its composition, bedding orientation, nature,
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The form and weighting of the shaft defines the balance, which itself defines the ease, efficiency, and comfort of use of the geologist's hammer.
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rocks often require heavier hammers for a more powerful blow. In such cases geologists may prefer a
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hammer of 2–2.5 lb (0.91–1.13 kg) has been described as most useful, although
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A geologist's hammer used to break up rocks, as well as a scale in the photograph
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Basic
Geological Mapping, John Barnes, Third Ed., Wiley, Chichester, 1995
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The best geologist's hammers are forged from one piece of
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A typical geologist's hammer (manufactured by
Estwing)
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