Greenstone/Chlorastrolite with Copper-Keweenaw-Michigan

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  • Item Category: Antiquities
  • Source: eBay
  • Sold Date: Apr 10, 2007
  • Channel: Auction House

Item: Greenstone/Chlorastrolite Gemstones - One Polished & 3 Unpolished

Origin: North America - Keweenaw Peninsula / Lake Superior Region

Location: Northwestern Upper Peninsula of Michigan - Keweenaw County

Physical Description and Properties:

Upper Michigan Mineral Specimens - Four (4) High Quality - Gemstone Grade Chlorastrolite - One (1) Polished & Three (3) Not Yet Tumbled or Polished.

Please Note: The beautiful polished gemstone in this unique and valuable collection has been removed from the same host rock as the other three yet to be worked gemstone specimens in this collection. While the polished stone itself may or may not be perfectly suitable for immediate placement in common standard size jewelry settings, it does clearly illustrate the fine quality display of chatoyant "turtleback" pattern and color and relative hardness of the other three gemstone specimens that are yet to be tumbled or polished .

The worked and polished gemstone contains a calcite filled botryoidal crystal geode in which native copper is also included.

The lightest weight specimen of the unpolished stones contains an interesting, but not readily identifiable Micro-Crystaline Mineral.

Approximate Sizes:

Specimen #1) Length of Polished Stone is: 5/8 in. L x 1/2 in. W x 3/8 in. T

Specimen #2) Length of Heaviest Unpolished Stone is: 3/4 in. L x 5/8 in. W x 1/2 in. T

Specimen #3) Length of Medium Weight Unpolished Stone is: 5/8 in. L x 1/2 in. W x 3/8 in. T

Specimen #4) Length of Lightest Unpolished Stone is: 3/4 in. L x 1/2 in. W x 1/4 in. T

Approximate Weights:

Specimen #1) Weight of Polished Stone is: 3.1 grams (or 15.5 cts.)

Specimen #2) Weight of Heaviest Unpolished Stone is: 2.8 grams (or 14 cts.)

Specimen #3) Weight of Medium Weight Unpolished Stone is: 2.3 grams (or 11.5 cts.)

Specimen #4) Weight of Lightest Weight Unpolished Stone is: 1.6 grams (or 8 cts.)

Approximate Combined/Total Weight of All Four (4) Gemstones is: 10 grams (or 50 cts.)

The Keweenaw Peninsula . . .

" . . . w stones are made of iron, and the hills are dug for copper . . . "

An excellent collection of rare Greenstone / Chlorastrolite Gemstones from the Keweenaw Peninsula region of Upper Michigan.

One polished, and three not yet tumbled or polished, these four fine quality Greenstone / Chlorastrolite Gemstone specimens will serve very well to enhance any beginning or established collection or investment of fine and precious native metals, minerals, and gemstone specimens.

Any fine specimen of Greenstone / Chlorastrolite from the Keweenaw Peninsula / Lake Superior region is very unique, extremely rare, and generally considered to be most valuable to mineral and metal collectors from around the world. Since no two naturally formed specimens are exactly alike; each wonderful specimen is cherished by finders and collectors alike for its unique qualities and charm and individual character.

This excellent collection of Greenstone / Chlorastrolite Gemstones was collected and removed from its copper mine poor-rock ore matrix sometime during the last century from one of the long abandoned (but still quite famous) copper mines of Upper Michigan's Keweenaw County, in the world famous Copper Country hills of The Keweenaw Peninsula Copper Range.

Much the same as other prehistoric and historic era copper mines that were abundantly mined for centuries (and - until very recently - were a significant hallmark of the Keweenaw landscape) the native copper mine w this impressive group of four Greenstone / Chlorastrolite Gemstones was mined and salvaged from was closed long ago, and no longer exists to bring such highly valuable and collectable specimens to light from deep beneath the surface of The Keweenaw's rich and famous mineral range.

T is still a very small (but rapidly - and forever - vanishing) remnant poor-rock ore pile of native metal bearing ore to be found at the location whe...