It is made in serpentine from The Lizard and is carried on a pedestal of Aberdeen granite.
He continues to be recognized for his work with Kwekwe serpentine and lapidolite.
Although reported from two other sites in the 19th century, it currently grows only on two serpentine hills on the island of Unst (see Keen of Hamar).
Six minerals have been classified as "asbestos" including chrysotile of the serpentine class and those belonging to the amphibole class: amosite, crocidolite, tremolite, anthophyllite and actinolite.
There are several minerals to be found in the area, the most prominent being mica, both blue and black in colour, but green, caramel and black serpentine as well as olivine can be found as well.
It includes four green serpentine stone vernacular buildings built between about 1790 and 1860.
In the area there are three colonies growing on separate serpentine outcrops on the prairie.
He discovered several rare plants growing on the serpentine rocks on Unst, including the endemic Shetland Mouse-ear Cerastium nigrescens, known as Edmondston's Chickweed on the island.
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John William Dawson (1865) described the banded structures of coarsely crystalline calcite and serpentine as a gigantic Foraminifera, making it the oldest known fossil.