Below are some detailed photos of a Mortae hand prop used in the 3rd season TOS episode "The Cloud Minders" (first airdate: Feb. 28, 1969). This was the primary tool used by the Troglytes on the planet Ardana to mine the mineral Zenite.
Many thanks to long-time Star Trek fan and collector Gordon from Pennsylvania for his kind permission to display these photos.
This particular Mortae was displayed at the National Air & Space Museum in 1992 as part of the Smithsonian's 11 month long Star Trek: The Exhibition event ...
Some episode screenshots from "The Cloud Minders" showing the prop ...