Pictures of Herkimer Diamonds and their Association with Other Minerals
The General Mineralization Sequence for the Herkimer Diamond Mining District*
Click on any mineral nameto see photos and more information
Rust - and related iron oxides
The depositional placement of the second dolomite and third dolomites appear to be happening throughout most of the Herkimer diamond making history, illustrated using the blue arrows. More data is needed because it is difficult to find overlapping relationships with dolomite that let us determine its time of growth relative to other minerals.
*The mineral depositional sequence is determined by carefully examining many specimens, across the entire district, to discover what minerals deposit on top of one another. For example, calcite is found to grow over the top of almost everything on this list. Each mineral event in the above sequence varies in intensity across a deposit, and across the mining district and thus lends a unique quality to each individual location within the district. This is the main reason why mines are different.
Rare occurrences of strontianite, celestite and chrysocola.
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& Crystal Frost
Updated - 03/09/2019
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New discovery (2016) of microscopic, unusually shaped, crystals at the quartz-hydrocarbon boundary (see Changes at the Boundary)
Last updated January 2018
Thank you Shannon Haley Wilbur for the donation of 30 samples from the Fonda region.1/05/2019 and 3/2/2019Check out her Facebook.