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Lake George area

*** Most pegmatites are either claimed or on private property. Permission required. ***

General Info

Pegmatites a few miles north of Lake George have produced some of the best amazonite, smoky quartz and topaz in Colorado. This area is similar to the Crystal Peak area to the east. The Mile-Hi RAMS club has a claim in this area for members only. To the south is a pegmatite called the Teller Pegmatite. The Lake George area extends west into Park County.

Minerals

Click on the image(s) below to see a picture of that mineral from this location.

Aeschynite - Meeves et al. reported this mineral from the Christie Ward - Lucky Thirteen pegmatite (Raines).

Albite - Often as white or colorless cleavelandite in radial growths of bladed crystals that are associated with amazonite and smoky quartz, reports Foord and Martin (Raines). Also found as white to cream-colored lamellae interspersed within amazonite.

Amazonite - Blue to blue-green to green color. Eckel says that crystals have been found up to 50 cm long (Raines). Manebach and Baveno twins occur. Foord reports that they may have white or buff-colored caps or stripes that are made of intermediate microcline, sanidine and/or orthoclase (Raines).

Amethyst - Sometimes a very pale color, and sometimes intergrown with goethite to form onegite.

Anatase - Kile reported small, black tetragonal crystals associated with rutile and microcline (Raines).

Apatite - Collins reported yellow-green crystals and masses associated with amazonite and smoky quartz (Raines). A pale blue crystal on black ferrocolumbite is located in the Denver Museum of Nature and Science collection (Raines).

Barite - Muntyan found a specimen with a tabular, .3 inch cream-white crystal of barite on albite. Berry reported small, gray crystals with white edges, and a 6.25 cm pseudomorph after microcline (Raines).

Barylite - Coil found two large, blue-gray to tan crystals in the area. They were associated with microcline, smoky quartz, quartz, barite, cassiterite, fluorite and limonite pseudomorphs after a rhombohedral carbonate mineral (Raines). Muntyan and Muntyan found a .9 cm crystal (Raines).

Bastnäsite-(Ce) - Tiny green-buff colored crystals were found on amazonite, according to Foord and Martin (Raines). Foord reported it has pseudomorphed allanite (Raines).

Bertrandite - Colorless crystals associated with amazonite were reported by Raines et al.

Beryl - Common beryl. Also, small colorless goshenite with amazonite was found by Kile (Raines).

Biotite - Blue-green lithian biotite has been reported by Eckel (Raines).

Calcite - Manganoan and ferroan calcite.

Cassiterite - Small crystals, sometimes associated with amazonite or fluorite, have been found in the area. One group was 2.5 cm and composed of intergrown black crystals on a dark purple matrix, according to Eckel (Raines).

Citrine - Eckel reports that citrine is rarely found in this area (Raines).

Feldspar

Ferrocolumbite - Shiny black crystals are uncommon in the area according to Eckel (Raines).

Fluorite - Usually colorless to lavender to deep purple, but can be pale green. Cubic and cuboctahedral are the most common form; octahedral forms are relatively rare according to Raines. Color zoning does occur. Crystals can occur as large as 10 cm, but in general, the larger they are, the poorer quality they are. Associated with microcline, amazonite, smoky quartz and goethite.

Goethite - Sprays of brown or black, shiny radiating crystals have been found. Individual crystals have been reported up to 3cm long (Raines). Associated with microcline, amazonite, fluorite and smoky quartz.

Goethite after Siderite - Yellow-brown to dark brown rhombohedrons; sometimes red due to the muddy clay that exists in many of the pockets where they formed. Streak is yellowish-brown. There is no way to confirm that the replaced mineral is siderite, so it could also be a few other rhombohedral minerals such as calcite or rhodochrosite.

Hematite after Siderite - Reddish-brown rhombohedrons; the red is due to the muddy clay that exists in many of the pockets where they formed. Streak is red. If washed off sufficiently, shiny, silvery metallic blades may be seen on the crystals. There is no way to confirm that the replaced mineral is siderite, so it could also be a few other rhombohedral minerals such as calcite or rhodochrosite.

Lepidolite - Lepidolite and ferroan lepidolite have been reported from the area.

Molybdenite - Kosnar reported that it occurs as hexagonal plates (Raines).

Monazite - Clove-brown colored, tabular crystals were collected by Willman, according to Raines.

Phenakite - Eckel reports that it may be colorless, yellow or gray (Raines). May be associated with albite, limonite, smoky quartz and topaz. Cross and Hillebrand reported small flat crystals on "amazonstone", a.k.a amazonite (Raines).

Quartz - Sometimes intergrown with goethite to form onegite. Can occur as overgrowths and scepters, reports Eckel (Raines).

Smoky Quartz - Can be very light to very dark brown and black colors; the darkest are most sought after by collectors. Often gemmy and lustrous. Can be double terminated and grow up to 1.2 meters according to Raines. Usually associated with amazonite, feldspar or cleavelandite.

Thorite - Xenotime and thorite pseudomorph was found by D. M. Davis (Raines).

Tourmaline - Small crystals and groups were reported by Eckel (Raines).

Xenotime-(Y) - This mineral has been noted by several people and was found as a pseudomorph with thorite by D. M. Davis (Raines).

Zinnwaldite - Raines et al. report that it occurs as "bronzy reddish-brown to nearly black pseudohexagonal books to 10 cm across". They may be associated with smoky quartz, amazonite and microcline.

Zircon - Shiny 3 cm crystals were reported by Kile (Raines).

Other Notable Minerals
Allanite, Elbaite, Ferrocalcite, Fluorapatite, Galena, Hastingsite, Hedenbergite, Hematite, Ilmenite, Manganocalcite, Manganosiderite, Microcline, Muscovite, Phlogopite, Rhodochrosite, Riebeckite, Rutile, Siderite, Topaz

Field Trip Reports

Sorry, no trip reports for this location yet.

References

  • S. Voynick, 1995, Colorado Rockhounding (ISBN 0-87842-292-7)
  • B. Muntyan, 1998, "Rocks & Minerals" (Vol. 73, July/August, pgs. 242-262)
  • E. Raines, 2001, "Rocks & Minerals" (Vol. 76, September/October, pgs. 298-325)
  • J. A. Murphy and P. J. Modreski, 2002, "Rocks & Minerals" (Vol. 77, July/August, pgs. 218-238)
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