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Island Mine, Alstead, Cheshire Co., New Hampshire, USA

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Detailed Mineral List:
'Albite-Anorthite Series'
Reference: USGS Prof Paper 255
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255
Photo: © Joseph Polityka. Almandine from Island Mine, Alstead, Cheshire Co., New Hampshire, USA
Beryl
Formula: Be3Al2(Si6O18)
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255
Photo: © 2008 Jeremy Zolan. Beryl from Island Mine, Alstead, Cheshire Co., New Hampshire, USA
Beryl var: Aquamarine
Formula: Be3Al2Si6O18
Reference: Rocks & Min. 65:302; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
Beryl var: Goshenite
Description: gem quality
Reference: Rocks & Min. 65:301; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
Beryl var: Heliodor
Reference: Sinkankas, 1989. Emeralds & Other Beryls, p.556.; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255
'Biotite'
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255
Fluorapatite
Formula: Ca2Ca3(PO4)3F
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255
Microcline
Formula: KAlSi3O8
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255
Quartz
Formula: SiO2
Reference: USGS Prof Paper 255
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index; USGS Prof Paper 255


12 entries listed. 7 valid minerals.

References

Gosse, Ralph (1968): Notes on Rare and Unusual New England Gemstones (Rocks & Minerals 43:753)

Mineral and/or Locality  
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