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Herkimer diamonds became widely recognized after workmen discovered them in large quantities while cutting into the Mohawk River Valley dolomite in the late 18th century. Geologists discovered exposed dolomite in
Herkimer County outcroppings and began mining there, leading to the "Herkimer diamond"
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can be found in these crystals that provide clues to the origins of the
Herkimer diamonds. Found within the inclusions are solids, liquids (salt water or petroleum), gases (most often
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and calcite. As sediment buried the rock and temperatures rose, crystals grew in the cavities very slowly, resulting in quartz crystals of exceptional clarity.
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Muskatt, H.S.; Tollerton, V.P. Jr. (September 18–20, 1992). "The Little Falls
Dolostone (Late Cambrian); stratigraphy and mineralogy". In April, R.H. (ed.).
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moniker. Double-terminated quartz crystals may be found in sites around the world, but only those mined in
Herkimer County can be given this name.
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53:; 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
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The geologic history of these crystals began about 500 million years ago in a shallow sea which was receiving
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and formerly as the Little Falls
Dolostone. While buried, cavities were formed by acidic waters forming the
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277:. New York State Geological Association Guidebook, annual meeting. Hamilton, NY. pp. 200–215.
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sediments accumulated and lithified to form the dolomite bedrock currently known as the
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in age, the quartz within the vugs is interpreted to have formed during the
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23:"Herkimer Diamant" - Middleville, County of Herkimer, New York, US
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in which the quartz crystals formed. While the dolomite unit is
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Video of mining for
Herkimer Diamonds with a jackhammer
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Website for the New York State
Academy of Mineralogy
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Book Review: Collector’s Guide to
Herkimer Diamonds
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61:, respectively, the crystal is also known as a
37:crystals discovered within exposed outcrops of
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113:. Waxy organic material, silicon dioxide and
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191:A Field Guide to Rocks and Minerals
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351:Prospecting for Herkimer Diamonds
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16:Quartz crystals found in New York
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324:from the original on 2020-05-26
255:from the original on 2021-02-27
215:from the original on 2009-11-23
171:from the original on 2008-09-14
49:Valley in the US. They are not
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287:: CS1 maint: date and year (
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233:Baldwin, Mike (2003-07-11).
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205:""Herkimer-style" Quartz"
189:Pough, Frederick (1960).
43:Herkimer County, New York
99:Little Falls Formation
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275:Field trip guidebook
111:Carboniferous Period
87:Adirondack Mountains
77:Process of formation
67:Little Falls diamond
678:Minerals portal
356:HerkimerHistory.com
235:"Herkimer Diamonds"
161:"Herkimer Diamonds"
95:magnesium carbonate
63:Middleville diamond
57:and in the city of
300:2017-08-23 at the
89:to the north. The
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573:Chrome chalcedony
547:Notable varieties
466:Cryptocrystalline
139:Cape May diamonds
85:from the ancient
32:double-terminated
28:Herkimer diamonds
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702:Quartz varieties
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644:Herkimer diamond
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318:Herkimer History
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193:. p. 232.
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242:MAGS Explorer
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649:Smoky quartz
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326:. Retrieved
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295:GEOLEX, USGS
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257:. Retrieved
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217:. Retrieved
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173:. Retrieved
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59:Little Falls
47:Mohawk River
27:
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578:Chrysoprase
533:Tiger's eye
413:Crystalline
165:Geology.com
55:Middleville
696:Categories
659:Prasiolite
588:Moss agate
583:Heliotrope
555:Chalcedony
474:Chalcedony
451:Stishovite
446:Seifertite
328:2019-11-26
259:2017-02-01
248:(7): 1–3.
219:2024-01-20
175:2008-09-10
146:References
123:Inclusions
45:, and the
616:Geyserite
568:Carnelian
507:Fulgurite
499:Amorphous
456:Tridymite
83:sediments
639:Ametrine
634:Amethyst
436:Moganite
405:minerals
322:Archived
298:Archived
250:Archived
213:Archived
169:Archived
133:See also
119:dolomite
107:Cambrian
51:diamonds
39:dolomite
611:Fiorite
431:Keatite
421:Coesite
91:calcium
626:Quartz
489:Jasper
441:Quartz
402:Silica
209:Mindat
115:pyrite
35:quartz
563:Agate
538:Aqeeq
484:Flint
479:Chert
253:(PDF)
238:(PDF)
65:or a
603:Opal
593:Onyx
517:Opal
289:link
103:vugs
93:and
30:are
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281:{{
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
