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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 -
Sudbury Impactite (SUD3)
Notes specific to this specimen: Beautiful, one-of-a-kind obelisk with even distribution of copper and nickel mineralizations. High gloss polish on all sides.
Note: We have decided to stop making obelisks – it wastes too much of this precious material. There is only ONE of this size left. The photos are of the exact piece you will be sent.
SIZE: 3″ tall
NAME: Sudbury Impactite
MINERALS: Pentlandite (nickel) & Chalcopyrite (copper)
AGE: Paleoproterozoic Era – 1.85 billion years
UNIT: Sudbury Impact Complex
SITE: Sudbury, Ontario, CanadaDocumentation: This specimen comes with a Certificate of Authenticity and Origin. In addition, an informative display card accompanies the specimen.
$335.00Sudbury Impactite (SUD3)
$335.00 -
Iron Stromatolites (ME10)
Notes specific to this specimen: Nice longitudinal colonies from the classic location of 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: 5.5″ x 6″ x 3/8″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990sDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$320.00Iron Stromatolites (ME10)
$320.00 -
Agatized Algae (AA6)
Notes specific to this specimen: A nearly complete round algal “egg” that retains some of its 3-D character. Very rare. This one has various sections to it which feature different textures and colors, including a nice blueish agate region which is unusual in these specimens.
SIZE: 4″x 2″x 2″
NAME: Undescribed species
AGE: Jurassic Period- 165 million years
UNIT: Curtis Formation
SITE: Emery County, Utah
DATE: 2010Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$320.00Agatized Algae (AA6)
$320.00 -
Volcanic Bomb (EB6)
Notes specific to this specimen: Complex plump fusiform bomb with smooth aerodynamic striations. Apparently ran into another bomb during flight and part of that bomb is still attached but is not complete. Natural breaks reveal chalcedony interior which fluoresces a vibrant green. Unusual.
SIZE: 7″ x 4″ x 4″
NAME: Various forms
AGE: Pliocene Epoch- 5 million years
UNIT: Banbury Formation
SITE: Elko County, NevadaDATE: 2020
Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$310.00Volcanic Bomb (EB6)
$310.00 -
Crystalized Clam (OK7)
Notes specific to this specimen: Great honey calcite crystals replacing one clam shell trapped in matrix. Some excellent radial calcite crystals are on this piece as well.
SIZE: 7″x 5″x 7″
Name / Species: Mercenaria permagna
Age: Pleistocene 2 Million Years
Unit: Nashua Formation
Site: Okeechobee County, Florida
Collected: 2023
Collected by:Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$310.00Crystalized Clam (OK7)
$310.00 -
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 -
Minnesota Thomsonite (MNT001)
Notes specific to this specimen: Rare dense accumulation of nodules in matrix, from what was known as a “Bonanza” zone in the “Pink Pit”. Colors varied from pit to pit in the mine. The Pink Pit was the largest and most accessible pit and was right in the center of the Thomsonite Mine, adjacent to the parking area. On rare occasions we would mine into a “Bonanza” which was a zone especially dense with nodules. This piece has a sawn flat bottom with smoothed and polished front and natural rough back. It has a very bright, large single nodule on the top, sticking out of the matrix with a brilliant polish. It could be removed and cut for jewelry.
Size: 2.5″ x 3″ 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.
$285.00Minnesota Thomsonite (MNT001)
$285.00 -
Gunflint Chert (GIS11)
Notes specific to this specimen: This is a fantastic specimen! Multiple very clear stromatolite colonies throughout the specimen. All the more impressive because it’s from the world-famous Gunflint Iron Formation. This piece is from our original discovery in 2025. Beautiful deep red colonies with a natural black halo unlike anything we’ve ever seen. Polished with brilliant shine on front face only. Back and edges are naturally rough.
SIZE: 1.5″ x 3″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$285.00Gunflint Chert (GIS11)
$285.00 -
Iron Stromatolites (ME11)
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″ x 4″ x 1/8 – 3/8″
Name: Collenia undosa
Unit: Biwabik Iron Formation
Site: Biwabik Iron Range, Minnesota
Date: Mid 1990sDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$285.00Iron Stromatolites (ME11)
$285.00 -
Rainbow Stromatolite (RS1)
Notes specific to this specimen: This is one of the original discovery pieces, collected by us in August 2025. It is characteristic of all the variety of colors found in this site. We’ve never seen such a variety of colors of stromatolite from a single site. It reminded us of all the colors of Arizona petrified wood – known as “Rainbow Wood” – and this became the source for our naming this new discovery “Rainbow Stromatolite”.
SIZE: 2″x 4″x 1.5″
Name Collenia sp. (possible new species)
Age Anamikean / Paleoproterozoic – 1.88 billion years
Unit Gunflint Iron Formation
Site Ontario, Canada
Date 2025Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$285.00Rainbow Stromatolite (RS1)
$285.00 -
Gypsum, Variety Selenite (AG7)
Notes specific to this specimen: Very complex large modified rhomboid crystal pattern with mirror-clean faces. Nice clear crystal selenite with no inclusions. The very edges of some of the crystals show some wear but this only accents the beauty of the overall piece.
Size: 6″ x 4″ X 1″
NAME: Gypsum, variety Selenite
AGE: Triassic Period, 240 million years
UNIT: Moenkopi Formation
SITE: Mohave County, Arizona
DATE: 2019Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$280.00Gypsum, Variety Selenite (AG7)
$280.00
