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Minnesota Thomsonite (MNT12)
Notes specific to this specimen: Cut and polished matrix piece from the old Thomsonite Mine along the North SHore of Lake Superior about five miles southwest of Grand Marais, Minnesota. Almost all the six polished surfaces have multiple Thomsonites.
Size: 2.5″ x 2″ x 1.5″
Name / Species: Thomsonite
Age: Mesoproterozoic Era, 1.1 billion years
Unit: Terrace Point Basalt
Site: Alley Agate Shop Thomsonite Mine Cook County, Grand Marais, MInnesota
Collected: 1981
Collected by: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$85.00Minnesota Thomsonite (MNT12)
$85.00 -
Minnesota Thomsonite (MNT11)
Notes specific to this specimen: Cut and polished matrix piece from the old Thomsonite Mine along the North SHore of Lake Superior about five miles southwest of Grand Marais, Minnesota. Many colorful small vesicles filled with gem Thomsonite.
Size: 4″ x 2″ x 1″
Name / Species: Thomsonite
Age: Mesoproterozoic Era, 1.1 billion years
Unit: Terrace Point Basalt
Site: Alley Agate Shop Thomsonite Mine Cook County, Grand Marais, MInnesota
Collected: 1981
Collected by: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$54.00Minnesota Thomsonite (MNT11)
$54.00 -
Crystalized Clam (OK14)
Notes specific to this specimen: Exceptional museum grade specimen. Classic full size clam loaded with juicy calcite crystals. No repairs, no touch up, no enhancements – just pure crystal joy. Full clam in matrix. Sits upright.
SIZE: 2″x 1.5″x 1″
Name / Species: Mercenaria permagna
Age: Pleistocene 2 - 4 Million Years
Unit: Nashua Formation
Site: Okeechobee County, Florida
Collected: 2026
Collected by: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$75.00Crystalized Clam (OK14)
$75.00 -
Crystalized Clam (OK13)
Notes specific to this specimen: Exceptional museum grade specimen. Classic full size clam loaded with juicy calcite crystals. No repairs, no touch up, no enhancements – just pure crystal joy. Full clam in matrix. Sits upright.
SIZE: 5″x 4″x 2″
Name / Species: Mercenaria permagna
Age: Pleistocene 2 - 4 Million Years
Unit: Nashua Formation
Site: Okeechobee County, Florida
Collected: 2026
Collected by: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$290.00Crystalized Clam (OK13)
$290.00 -
Crystalized Clam (OK12)
Notes specific to this specimen: Exceptional museum grade specimen. Classic full size clam loaded with juicy calcite crystals. No repairs, no touch up, no enhancements – just pure crystal joy. Full clam in matrix. Sits upright.
SIZE: 5″x 3″x 3″
Name / Species: Mercenaria permagna
Age: Pleistocene 2 - 4 Million Years
Unit: Nashua Formation
Site: Okeechobee County, Florida
Collected: 2026
Collected by: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$385.00Crystalized Clam (OK12)
$385.00 -
Iron Stromatolites (ME16)
Notes specific to this specimen: Beautiful deep red agatization in these cross-cut colonies attest to the classic origin of this specimen as being from the old Mary Ellen Mine in Biwabik, Minnesota, the type locality for the Biwabik Iron Formation. The mine shut down over 50 years ago. We find these specimens in the old discard piles that surround the old pit. *This specimen comes with a Certificate of Authenticity and Origin.
Size: 4.5″x 5″x 3/8″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990s
By: Jon & JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$335.00Iron Stromatolites (ME16)
$335.00 -
Iron Stromatolites (ME15)
Notes specific to this specimen: Beautiful deep red agatization in these cross-cut colonies attest to the classic origin of this specimen as being from the old Mary Ellen Mine in Biwabik, Minnesota, the type locality for the Biwabik Iron Formation. The mine shut down over 50 years ago. We find these specimens in the old discard piles that surround the old pit. *This specimen comes with a Certificate of Authenticity and Origin.
Size: 4.5″x 4.5″x 3/8″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990s
By: Jon & JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$335.00Iron Stromatolites (ME15)
$335.00 -
Iron Stromatolites (ME14)
Notes specific to this specimen: Beautiful deep red agatization in these cross-cut colonies attest to the classic origin of this specimen as being from the old Mary Ellen Mine in Biwabik, Minnesota, the type locality for the Biwabik Iron Formation. The mine shut down over 50 years ago. We find these specimens in the old discard piles that surround the old pit. *This specimen comes with a Certificate of Authenticity and Origin.
Size: 4.5″x 4.5″x 3/8″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990s
By: Jon & JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$335.00Iron Stromatolites (ME14)
$335.00 -
Banded Iron Formation (BIF22)
Notes specific to this specimen: Completely rough and natural. Nice small hand specimen recently excavated. Beautiful colors of deep red jasper alternating with silver hematite banding. From the classic BIF Type Locality of Jasper Knob in Ishpeming, Michigan.
SIZE: 3.5″x 2″ x 2″
Minerals: Jasper & Hematite
Age: Paleoproterozoic – 2.1 billion years
Unit: Negaunee Iron Formation
Site: Ishpeming, Michigan
Collected: September 2026
By: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$42.00 -
Banded Iron Formation (BIF21)
Notes specific to this specimen: Completely rough and natural. Nice small hand specimen recently excavated. Beautiful colors of deep red jasper alternating with silver hematite banding. From the classic BIF Type Locality of Jasper Knob in Ishpeming, Michigan.
SIZE: 3.5″x 2″ x 2″
Minerals: Jasper & Hematite
Age: Paleoproterozoic – 2.1 billion years
Unit: Negaunee Iron Formation
Site: Ishpeming, Michigan
Collected: September 2026
By: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$42.00 -
Banded Iron Formation (BIF14)
Notes specific to this specimen: What a cool piece! Classic curved arch bedding with polished face and rough back. Nice hefty specimen recently excavated. Beautiful colors of red jasper alternating with silver hematite banding. A great specimen cut and polished to show off its unique aspects. From the classic BIF Type Locality of Jasper Knob in Ishpeming, Michigan.
SIZE: 6″x 3″ x 2″
Minerals: Jasper & Hematite
Age: Paleoproterozoic – 2.1 billion years
Unit: Negaunee Iron Formation
Site: Ishpeming, Michigan
Collected: September 2026
By: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$185.00Banded Iron Formation (BIF14)
$185.00 -
Banded Iron Formation A/B Pair (BIF13)
Notes specific to this specimen: This is the first time we’ve offered a sliced and polished matched pair. Nice hand specimen recently excavated. Beautiful colors of nice red jasper alternating with silver hematite banding. A classic specimen cut in two, with the face of each side polished while the rest is naturally rough. From the classic BIF Type Locality of Jasper Knob in Ishpeming, Michigan.
SIZE: 4″x 3″ x 2″
Minerals: Jasper & Hematite
Age: Paleoproterozoic – 2.1 billion years
Unit: Negaunee Iron Formation
Site: Ishpeming, Michigan
Collected: September 2026
By: Jon KramerDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$120.00
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