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Specimens from the Gregory Crenko Illinois Fluorite Collection
Greg's interest in minerals started at about age 10 when he found Quartz crystals in local corn fields. Greg has been active in mineral collecting and trading for the past 30 years. At one time he was an avid field collector and found the first confirmed finding of Caffersite (Smithsonian did the analysis) in the Sawtooth Mountains batholith of Idaho.

With good foresight he decided, early on, to specialize in Southern Illinois Fluorites when they were more available. He realized there was good opportunity as a dealer of collectible mineral specimens due to the development of the internet and increasing competition for high quality world wide minerals. He is the owner of Top Shelf Minerals.

Greg is an accomplished self taught guitar player and songwriter and has toured with some national acts. As seen in the photo, he is also an animal lover.

I am pleased to offer this first installment of fine Illinois Fluorite specimens from his collection, which I recently acquired. There will be further installments over the coming months.

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Lustrous dark golden Fluorite crystal cluster with outer purple zoning. In fine condition.
Beautiful, purple, translucent, stepped face Fluorite crystals with Galena and Sphalerite. Very presentable from both sides and in fine condition.
Dark golden Fluorite crystals with some outer purple zoning and accompanying white Barite.
Very aesthetic cluster of purple-blue Fluorite crystals with some stepping formation and beveled edges. In very good condition.
Yellow Fluorite crystal cluster with wonderful bluish zoning and adornment of Calcite crystals.
Very nice bi-colored purple and dark yellow Fluorite crystal cluster.
Nice size specimen of dark purple Fluorite cubes perched aesthetically on a plate of Sphalerite crystals.
Well balanced cluster of translucent golden Fluorite crystals with some outer purplish zoning. In fine condition.
Lustrous, rootbeer colored Fluorite crystal cluster with dark outer zoning. In fine condition. The upper left corner of the central large crystal is not damaged, but has a whitish color due to natural internal fractures.
Very pretty cluster of yellow Fluorite crystals with pronounced bluish zoning.
Superb yellow Fluorite crystal cluster with dots of purple and adorning Calcite crystals.
Large blue Fluorite crystal with multiple zones of dark blue-purple. Presentable from several sides. In very good condition.
Fine specimen of gemmy yellow Fluorite cubes with lighter, almost glassy outer zoning on Sphalerite.
An aesthetic cluster of Fluorite crystals with a raspberry-purple and yellow coloration.
Nice size cluster of lustrous golden Fluorite crystals with outer purple zoning.
Golden Fluorite crystals with light purple outer zoning and aesthetic surface texture from "natural" acid etching.
Wonderful, honey colored Fluorite crystals on Sphalerite. Has some purple outer zoning.
Stunning blue Fluorite crystal cluster with Calcite.
In fine condition.

Golden Fluorite crystal cluster with splashs of raspberry-purple coloration.
Nice plate of dark purple Fluorite crystals.
Gemmy yellow Fluorite crystals with light blue outer zoning  and with Barite scattered on the surface of the crystals. Even better in person !!
Aestehtic dark blue to light purple Fluorite cubes with dark purple zoning.
Very attractive grouping of yellow Fluorite crystals nicely contrasted by surrounding very pale yellow to almost clear outer crystals.
Excellent specimen of the most sought after true blue variety of Illinois Fluorite with some complimenting double terminated Calcite crystals. In fine condition.
Sizable plate of yellow-golden Fluorite crystals with some bluish zoning and surface texturing from "natural" acid etching.
Gorgeous, well balanced cluster of blue Fluorite crystals.
Pretty crystal of golden Fluorite with a thick teal blue outer zone.
Large plate of lovely purple Fluorite crystals with Chalcopyrite.
Very nice cluster of golden Fluorite with some outer zoning.
Beautiful purple Fluorite crystals with Galena.
Click here for information on Fluorite: The Illinois State Mineral
Click here for more information on Fluorite - Illinois's State Mineral
Click here for more information, and photographs, on Illinois Mines
Fluorite, the official Illinois State Mineral, was discovered in 1839 by James Anderson while digging a well near Fairview Landing one half mile SW of this site. Fluorite was a waste product until the steel industry began using the mineral in their open hearth process in 1888. Rosiclare Lead and Fluorspar Mining Co., located 255 yards NW of this site, was the first major producer of Fluorite. The largest and deepest Fluorite mines in the world are located in Hardin County. For many years these mines produced about three-fourths of the Fluorite mined in the United States.
The word fluorite is derived from the Latin root fluo, meaning "to flow" because the mineral is used to increase the fluidity of slags used in smelting flux.
Fluorite has been the state mineral of Illinois since 1965. At that time, Illinois was the largest producer of Fluorite in the United States, but the last Fluorite mine in Illinois was closed in 1995
The largest documented single crystal of Fluorite was a cube 2.12 m in size and weighed approx. 16 tons.
Fluorite comes in a wide range of colors and has subsequently been dubbed "the most colorful mineral in the world". The most common colors are purple, blue, green, yellow, or colorless. Less common are pink, red, white, brown, black, and nearly every shade in between. Color zoning or banding is commonly present. The color of the fluorite is determined by factors including impurities, exposure to radiation, and the size of the color centers.
Wonderful contrasts of honey colored Fluorite cubes with teal colored zoning and complimenting light golden Calcite crystals. In very good condition.
Click here for: Introduction to Fluorite
By Bob Jones for "Rock & Gem" magazine
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Golden Fluorite with Purple Zoning
West Green Mine, Hardin County, Illinois, USA
6.5 x 4.5 x 3.5 cm
Ex-Gregory Crenko Collection
          SOLD.
Purple Fluorite Crystal Cluster with Galena & Sphalerite
Hill Ledford Mine, Hardin County, Illinois, USA
7.5 x 6.5 x 3 cm
Ex-Gregory Crenko Collection
       SOLD
Barite on Fluorite Crystal Cluster
Minerva #1 Mine, Hardin County, Illinois, USA
7 x 4.5 x 3.5 cm
Ex-Gregory Crenko Collection
       $275
Purple Fluorite Crystal Cluster
Denton Mine, Hardin County, Illinois, USA
11.5 x 7.5 x 6.5 cm
Ex-Gregory Crenko Collection
          SOLD
Yellow Fluorite with Blue Zoning and Calcite
Annabel Lee Mine, Hardin County, Illinois, USA
6.5 x 5 x 4 cm
Ex-Gregory Crenko Collection
      SOLD
Bi-Colored Fluorite Cluster
Minerva #1 Mine, Hardin County, Illinois, USA
8 x 6.5 x 5 cm
Ex-Gregory Crenko Collection
      SOLD
Purple Fluorite Crystals on Sphalerite
Denton Mine, Hardin County, Illinois, USA
16.5 x 10 x 2 cm
Ex-Gregory Crenko Collection
       SOLD
Yellow Fluorite Crystal Cluster
Annabel Lee Mine, Hardin County, Illinois, USA
9 x 7.5 x 4 cm
Ex-Gregory Crenko Collection
       SOLD
Golden Fluorite Cluster
Denton Mine, Hardin County, Illinois, USA
10.5 x 8 x 4 cm
Ex-Gregory Crenko Collection
       SOLD
                            
Yellow Fluorite Crystals with Purple Zoning
Hill Mine, Hardin County, Illinois, USA
6.5 x 3.5 x 2 cm
Ex-Gregory Crenko Collection
      $325
Golden Fluorite Crystal Cluster with Calcite
Minerva #1 Mine, Hardin County, Illinois, USA
13 x 9.5 x 6.5 cm
Ex-Gregory Crenko Collection
      SOLD
Blue Fluorite Crystal with Blue & Purple Zoning
Minerva #1 Mine, Hardin County, Illinois, USA
7 x 6.5 x 6.5 cm
Ex-Gregory Crenko Collection
       SOLD
Yellow Fluorite Crystals on Sphalerite
Minerva #1 Mine, Hardin County, Illinois, USA
11 x 8 x 4 cm
Ex-Gregory Crenko Collection
    SOLD
Raspberry Colored Fluorite Cluster
Annabel Lee Mine, Hardin County, Illinois, USA
10.5 x 6.5 x 2.5 cm
Ex-Gregory Crenko Collection
        $440
Golden Fluorite Crystals with Purple Zoning
Minerva #1 Mine, Hardin County, Illinois, USA
7.5 x 6.5 x 3 cm
Ex-Gregory Crenko Collection
        $375
   
Golden Fluorite Crystal Cluster with Purple Zoning & Sphalerite
Minerva #1 Mine, Hardin County, Illinois, USA
11 x 8.5 x 5 cm
Ex-Gregory Crenko Collection
       SOLD
Yellow Fluorite Crystals on Sphalerite
Minerva # 1 Mine, Hardin County, Illinois, USA
10 x 9.5 x4.5 cm
Ex-Gregory Crenko Collection
        SOLD
Blue Fluorite Cluster with Calcite
Minerva #1 Mine, Hardin County, Illinois, USA
9 x 6.5 x 4.5 cm
Ex-Gregory Crenko Collection
     SOLD
Golden-Raspberry Colored  Fluorite Crystal Cluster
Denton Mine, Hardin County, Illinois, USA
8 x 8 x 7 cm
Ex-Gregory Crenko Collection
   SOLD
Purple Fluorite Crystal Cluster
Denton Mine, Hardin County, Illinois, USA
9 x 8 x 1.5 cm
Ex-Gregory Crenko Collection
     $300
Yellow Fluorite Cluster with Barite
Minerva #1 Mine, Hardin County, Illinois, USA
10 x 8 x 6.5 cm
Ex-Gregory Crenko Collection
       SOLD
Light Purple Fluorite Crystals with Dark Purple Zoning
Gaskins Mine, Pope County, Illinois, USA
7.5 x 5.5 x 4.5 cm
Ex-Gregory Crenko Collection
       $400
Yellow Fluorite Crystal Cluster
Annabel Lee Mine, Hardin County, Illinois, USA
10 x 9 x 3 cm
Ex-Gregory Crenko Collection
     SOLD

Blue Fluorite Cluster with Calcite
Minerva #1 Mine, Hardin County, Illinois, USA
11 x 10 x 5.5 cm
Ex-Gregory Crenko Collection
    $10,000
Golden Fluorite with Blue Zoning & Calcite
Minerva #1 Mine, Hardin County, Illinois, USA
12.5 x 9 x 8.5 cm
Ex-Gregory Crenko Collection
      $2,700
Purple Fluorite Crystals & Galena
Davis/Deardorff Mine, Hardin County, Illinois, USA
12 x 5 x 2 cm
Ex-Gregory Crenko Collection
       SOLD
Golden Fluorite Cluster
Minerva #1 Mine, Hardin County, Illinois, USA
9.5 x 6 x 4.5 cm
Ex-Gregory Crenko Collection
       $600
Purple Fluorite Cluster with Chalcopyrite
Denton Mine, Hardin County, Illinois, USA
18 x 14 x 7.5 cm
Ex-Gregory Crenko Collection
       $1,000
Fluorite Crystal
Minerva #1 Mine, Hardin County, Illinois, USA
5 x 5 x 4.5 cm
Ex-Gregory Crenko Collection
      SOLD
Blue Fluorite Cluster
Minerva #1 Mine, Hardin County, Illinois, USA
6 x 5 x 2 cm
Ex-Gregory Crenko Collection
     $800
Yellow-Golden Fluorite Crystal Cluster with Natural Etching
Annabel Lee Mine, Hardin County, Illinois, USA
16.5 x 12 x 4 cm
Ex-Gregory Crenko Collection
        $500