Arthur Koch's Gallery

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Almandine : Fe2+3Al2[SiO4]3, Muscovite : KAl2[(OH)2|AlSi3O10]
	Woodlawn Quarry, Wilmington, New Castle Co., Delaware, USA Almandine on Muscovite; crystal 2.9 cm x 2.1 cm, matrix 10.0 cm long; collector/photographer Arthur Koch A piece proudly displayed in my personal collection, this is by far the best recovered from the site (as far as I know). Although not of the best color for garnet, this is the largest crystal I recovered from a place where garnets are ...
© Arthur Koch	Photo ID: 119274    View Count: 155
Almandine : Fe2+3Al2[SiO4]3, Muscovite : KAl2[(OH)2|AlSi3O10]
	Woodlawn Quarry, Wilmington, New Castle Co., Delaware, USA Almandine on Muscovite; crystal 2.4 cm x 2.0 cm, matrix 3.7 cm long; collector/photographer Arthur Koch This is another nice matrix garnet, and is also one of the biggest garnets from the site. It's part of my personal collection.
© Arthur Koch	Photo ID: 119275    View Count: 132
Almandine : Fe2+3Al2[SiO4]3
	Woodlawn Quarry, Wilmington, New Castle Co., Delaware, USA Almandine; crystal 2.6 cm x 2.1 cm; collector/photographer Arthur Koch After being freed from surrounding muscovite that was decaying, this crystal exhibits very interesting growth patterns from the layers of mica it had butted up against. Also a very large garnet for the locale and part of my collection.
© Arthur Koch	Photo ID: 119276    View Count: 150
Almandine : Fe2+3Al2[SiO4]3
	Woodlawn Quarry, Wilmington, New Castle Co., Delaware, USA Almandine on Muscovite; crystal 1.5 cm x 1.3 cm; collector/photographer Arthur Koch Most crystals from the former mine exhibit a modified dodecahedron habit. However, a few show the more classic sharp faces and the dodecahedral shape. The luster of this crystal is also excellent compared to most from the site. Part of my collection.
© Arthur Koch	Photo ID: 119277    View Count: 134
Beryl : Be3Al2Si6O18, Muscovite : KAl2[(OH)2|AlSi3O10], Quartz : SiO2
	Ray Mica Mine (Wray Mine), Hurricane Mt., Burnsville, Black Mtn-Bowlens Creek Area, Spruce Pine District, Pisgah National Forest, Yancey Co., North Carolina, USA Beryl with Musovite in Quartz; crystal 3.4 cm (both parts combine) x 1.7 cm, matrix 6.0 cm long; collector/photographer Arthur Koch A nice but not terminated green beryl crystal with some accessory muscovite. I'm uncertain as to whether these are two separate crystals, or one that broke apart at some point during formation.
© Arthur Koch	Photo ID: 119272    View Count: 194
Pyrite : FeS2
	Interstate 83 Roadcut, Leader Heights (near Jacobus), York Co., Pennsylvania, USA Pyrite on Shale; crystal 2.5 cm x 1.8 cm, matrix 9.5 cm long; collector/photographer Arthur Koch Currently in my personal collection, this repaired pyrite crystal represents one of the largest found from the locality (possibly the largest), and the largest on matrix I know of.
© Arthur Koch	Photo ID: 119269    View Count: 121
Pyrite : FeS2
	Interstate 83 Roadcut, Leader Heights (near Jacobus), York Co., Pennsylvania, USA Pyrite on Shale; main crystal just over 5/8" x 1/2", matrix 6" long; collector/photographer Arthur Koch This represents a relatively rare pair of penetrating pyrite crystals from the site. Part of my personal collection, it is the best example I have seen from the roadcut.
© Arthur Koch	Photo ID: 119270    View Count: 155
Pyrite : FeS2
	Interstate 83 Roadcut, Leader Heights (near Jacobus), York Co., Pennsylvania, USA Pyrite; main crystal just over 1/2" x 3/8"; collector/photographer Arthur Koch Another from my personal collection, this is another pair of penetrators. This is as large as the penetrators typically get. Like a lot of crystals from the site there is a bit of oxidation.
© Arthur Koch	Photo ID: 119271    View Count: 115
Schorl : [Na][Fe2+3][Al6][(OH)3|OH|(BO3)3|Si6O18], Muscovite : KAl2[(OH)2|AlSi3O10], Quartz : SiO2
	Ray Mica Mine (Wray Mine), Hurricane Mt., Burnsville, Black Mtn-Bowlens Creek Area, Spruce Pine District, Pisgah National Forest, Yancey Co., North Carolina, USA Schorl on/in Muscovite on Quartz; crystal 2.6 cm x 0.2 cm, matrix 4.6 cm long; collector/photographer Arthur Koch Part of my NC collection, this is a good example of the intergrowth between the schorl tourmaline and muscovite that can be found at the mine and other locales in the North Carolina mountains.
© Arthur Koch	Photo ID: 119273    View Count: 179

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