Properties
No property table for this entry: the article it resolves to has no infobox, so Mohs hardness, crystal system and the other properties are not available. Nothing has been estimated or added.
From the Wikipedia article
Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. They are not diamonds; the "diamond" in their name is due to both their clarity and well-formed faces. Because the first discovery sites were in the village of Middleville and in the city of Little Falls, respectively, the crystal is also known as a Middleville diamond or a Little Falls diamond.
Source
Source record: crystal-compendium/herkimer-diamond/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Herkimer_diamond — revision id 1356579887. Text and properties from Wikipedia, licensed CC BY-SA 4.0.