Provenite

Conway (Redstone area), Carroll County

AreaDraft data

44.0147° N, 71.1011° W · ± 10 km

Smoky quartz from New Hampshire, United States, with photos of specimens from this locality.

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Minerals found here

Smoky quartz

On the same specimen

Same specimen Microcline with Quartz

1 specimen photo(s) from this locality show quartz with microcline together. The pairing comes from the photographer's file name and label, so the relationship between the two minerals is not specified.

Same specimen Albite with Quartz

1 specimen photo(s) from this locality show quartz with albite together. The pairing comes from the photographer's file name and label, so the relationship between the two minerals is not specified.

Smoky quartz at Conway (Redstone area), Carroll County

Old smoky quartz crystal, labelled Conway, New Hampshire.
Old smoky quartz crystal, labelled Conway, New Hampshire.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Smoky quartz crystals balanced with sharp microcline, labelled Conway, New Hampshire.
Smoky quartz crystals balanced with sharp microcline, labelled Conway, New Hampshire.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Smoky quartz crystal with albite on an old-label specimen, labelled Conway, New Hampshire.
Smoky quartz crystal with albite on an old-label specimen, labelled Conway, New Hampshire.
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
Formula
SiO₂
Morphology
Simple prismatic crystals with terminating rhombohedra, singly or in groups in miarolitic cavities
Typical size
Photographed specimens 6 to 9 cm
Color / luster
Smoky to black, often zoned with colourless cores
Associated minerals
Microclinealbitetopazfluoritechlorite
Surface features
Deeply striated prism faces
Availability
No longer available
History
Quarried area visited by researchers in 1918, 1921 and 1926; many old-time specimens in collections

Sources: SRC-441 SRC-442 SRC-449

About Smoky quartz →

Geology of the locality

Setting
Post-Devonian biotite granite with pegmatitic sheets carrying miarolitic cavities lined with smoky quartz and microcline.
Host rock
Biotite granite (Conway granite)
Region
New Hampshire
Country
United States

Photo labels give only Conway, Carroll County. Coordinates are those of Redstone village (Wikipedia); the described Redstone quarry lies in the same township, so the position is area-level only. The granite name is the commonly used one; the opened summary calls it an unnamed biotite granite of the Pemigewasset series.

Sources: SRC-441 SRC-442

Sources

  1. SRC-441 · Website
    Redstone, New HampshireWikipedia contributors · Wikipedia
  2. SRC-442 · Website
    Smoky quartz of Conway, New Hampshire (summary of Gillson, 1927)Mineralogical Society of America (Collectors Corner archive) · Mineralogical Society of America
  3. SRC-449 · Website
    File:Quartz-Microcline-182568.jpg and related Conway files (Robert M. Lavinsky)Wikimedia Commons · Wikimedia Commons

Draft data from the Provenite workbook. Check entries against the cited sources before relying on them. Photos are open-licence images from Wikimedia Commons; the author and licence are given with each photo.