Merthyr Diamond
A synonym of '"Herkimer-style" Quartz'
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Formula:
SiO2
Synonym:
A synonym of "Herkimer-style" Quartz
Welsh local name for herkimer-style quartz crystals from the South Wales Coalfield.
The waterclear quartz crystals (locally known as Merthyr Diamonds) occur both in septarian clay-ironstone nodules and in mineralized joint-veins hosted by massive sandstones. These can occasionally exceed 4 cm in length and often contain visible fluid inclusions with vapour bubbles. Firth (1971) described and illustrated some examples: sadly, samples are less easy to find today because so many coal-tips have been reclaimed. (Adapted from http://www.museumwales.ac.uk/mineralogy-of-wales/database/?mineral=253.)
The waterclear quartz crystals (locally known as Merthyr Diamonds) occur both in septarian clay-ironstone nodules and in mineralized joint-veins hosted by massive sandstones. These can occasionally exceed 4 cm in length and often contain visible fluid inclusions with vapour bubbles. Firth (1971) described and illustrated some examples: sadly, samples are less easy to find today because so many coal-tips have been reclaimed. (Adapted from http://www.museumwales.ac.uk/mineralogy-of-wales/database/?mineral=253.)
Unique Identifiers
Mindat ID:
47169 (as Merthyr Diamond)
1877 (as "Herkimer-style" Quartz)
3337 (as Quartz)
1877 (as "Herkimer-style" Quartz)
3337 (as Quartz)
Long-form identifier:
mindat:1:1:47169:3 (as Merthyr Diamond)
mindat:1:1:1877:3 (as "Herkimer-style" Quartz)
mindat:1:1:3337:0 (as Quartz)
mindat:1:1:1877:3 (as "Herkimer-style" Quartz)
mindat:1:1:3337:0 (as Quartz)
Internet Links for Merthyr Diamond
mindat.org URL:
https://www.mindat.org/min-47169.html
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