Independent comparisons. We may earn from shop links. More info

How to use a geological hammer

Updated: 24 October 2026

You have a geological hammer in your hand and a loose pebble in front of you. The useful outcome is a small, controlled chip, or a decision to put the tool away. This page is the blow: eyes, stance, a separate chisel, a grip that stays put, and when you retire the head. It does not rank the eleven listings on the [rock hammer comparison](/hub/hand-tools/rock-hammer), and it does not decide whether Charmouth or an SSSI allows a swing. That site question is on the [fossil hunting hammer UK](/hub/hand-tools/rock-hammer/sub/rock-hammer-fossil-collecting) page. Peter F. used university and society notes, not a lab strike. A qualifying purchase can earn a commission at no extra cost to you.

You have a geological hammer in your hand and a loose pebble in front of you. The useful outcome is a small, controlled chip, or a decision to put the tool away.

Our top picks

INCLY INCLY 5-piece geology kit

Best overall

INCLY INCLY 5-piece geology kit
9.6/10about £26.99
View offer
Tanstic Tanstic 6-piece geology kit

Best value

Tanstic Tanstic 6-piece geology kit
9.1/10about £21.99
View offer
Estwing Estwing E13PM rock pick

Alternative

Estwing Estwing E13PM rock pick
9.0/10about £39.00
View offer
On this page
  1. 1.Before the first blow
  2. 2.Pick, face, and a separate chisel
  3. 3.Grip, guard, and rust
  4. 4.When to stop

Before the first blow

Wear impact eye protection for every blow. Liverpool's geology fieldwork appendix tells students to wear goggles when hammering. Glasgow and Hull ask for impact eye protection for anyone nearby. Kit glasses here name neither EN 166 nor BS EN ISO 16321-1. Liverpool's student rule puts bystanders beyond 2 metres. A cracked face, a loose sleeve or a mushroomed chisel is a reason to stop. The Geological Society's March 2012 note says to hammer as little as possible. Prefer a loose piece. If the only rock is a cliff or unchecked bedrock, leave the hammer in the bag.

Pick, face, and a separate chisel

The point can start a crack in a hard loose piece. The flat face is what you use on a separate chisel. Hull prefers a cold chisel to using the hammer as a chisel, because hardened steel can splinter. Liverpool says never to strike one geological hammer with another. Glasgow says never to use a second hammer as a chisel. A kit has not cancelled those warnings. A hand guard is not a substitute for eyes. The INCLY seven-piece bullet says the grip guard might shift. A German review on the Mardatt kit says chisel fragments injured an arm. That is one non-UK review, not a rate. Which end to buy is the pointed or chisel rock hammer page.
INCLY INCLY 5-piece geology kit

Testsieger

INCLY INCLY 5-piece geology kit
9.6/10about £26.99
View offer

Grip, guard, and rust

Stop if the grip moves. UK reviews on the KOHAND pair say the rubber grip slips off, and one says the handles come off after a couple of hours and calls that dangerous. Dry the steel before it goes into a bag. Tanstic, KOHAND, KEILEOHO and Mardatt reviews describe rust after rain or wet rock. A stainless line in the bullets is a listing claim, not a weekend test. Several Estwing E13PM reviews say the pictured sheath was not in the box, and one calls the uncovered point a safety issue. Cover the point with a sheath you actually own.

When to stop

Retire the tool when the head has chipped, the face has cracked, the first blow has bent or broken it, or the grip has left the shaft. A chisel that has thrown metal is finished. Ongoing stone cutting that raises silica dust is where a professional should take over. Metal in the skin needs medical help, not a second swing. A group under a cliff with no tide plan should not be swinging. A sound hammer does not make a prohibited outcrop into a place you may strike.

Common questions

Do I wear goggles for every blow?
Yes. Liverpool, the Geological Society of Glasgow and Hull Geological Society all treat hammering, and chisels, as eye work. Chips travel on a light blow as well as a heavy one. Glasses packed in a geology kit do not name EN 166 or BS EN ISO 16321-1, so they are not a named certificate. Wear impact protection you have chosen, and keep it on while anyone else is still striking nearby.
Can I use the pick to strike the chisel in the kit?
Use the flat face if you must strike a separate chisel, and do not use the point as a punch. Liverpool says not to strike one geological hammer with another. Hull prefers a cold chisel because hardened steel can splinter, and Glasgow says not to use a second hammer as a chisel. A kit that includes both tools has not published a rating that cancels those notes. If the chisel head has mushroomed or thrown metal, stop.
What is a mushroomed chisel head?
It is the spread lip of steel that forms when the struck end of a chisel has been hit past its shape. The lip can shear off. Society notes treat that as a reason to maintain or retire the chisel, not as a cosmetic mark. One German review on a Mardatt kit describes fragments leaving the chisel and injuring an arm. That single non-UK report is not a failure rate, Retire a damaged head before that happens.
What do I do if the rubber grip slides?
Stop using that hammer. Reviews on KOHAND, a JOIKIT single and a KEILEOHO pair describe a sleeve or handle that comes off, including after one use or a couple of hours. Gluing it back on the shore is not a field repair.
How do I stop beach rust?
Dry the steel before it goes into a bag, including after wet rock and rain, not only after the sea. Reviews on Tanstic, KOHAND, KEILEOHO and Mardatt describe rust when the tool was left damp. A coating or a stainless line in the bullets is a claim on the listing, not a result from a weekend that was tested here. Wipe it the same day, and do not store it in a wet rucksack.
When do I stop and bin the tool?
Stop when the face cracks, the point bends on a first blow, the chisel has thrown metal, or the grip has moved. Seek medical help if metal is in the skin. Hand the job on when the work is ongoing stone cutting with silica dust, or when the group is under a cliff with no tide plan. A sound hammer does not make a prohibited outcrop into a place you may strike.

Related pages

Rock hammer buying guide

Rock hammer

Best rock hammer UK: three jobs and who should skip

Fossil hunting hammer UK: when the beach does not need one

Pointed or chisel rock hammer: match the end to the rock

Sources

Sources from the research digest, last checked on 22 October 2026.

  1. Geological Society / CHUGD field-hammer note (March 2012) (retrieved 22.10.2026)
  2. NatureScot, Scottish Fossil Code guidance (retrieved 22.10.2026)
  3. West Dorset fossil collecting code (retrieved 22.10.2026)
  4. GOV.UK SSSI consent and enforcement (retrieved 22.10.2026)
  5. HSE, using the right type of PPE (retrieved 22.10.2026)
  6. BSI on EN ISO 16321 (retrieved 22.10.2026)
  7. Axial, Estwing E3-22P rock pick (retrieved 22.10.2026)
  8. GEOetc geological-hammer guide (retrieved 22.10.2026)