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Kona Dolomite (KONA9)
Notes specific to this specimen: This is an excellent sliced section showing multiple stromatolite colonies with distinct layers (laminae). The clear layering is unusual for this slightly metamorphosed material. It has a smooth back and a flat bottom so it stands up nicely.
SIZE: 6″ x 3″ x 1″
NAME: Collenia kona
AGE: Paleoproterozoic Era 2.3 billion years
UNIT: Kona Formation
SITE: Kona Hills, Michigan
DATE: 2023Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin. In addition, an attractive and informative display card accompanies the specimen.
$245.00Kona Dolomite (KONA9)
$245.00 -
Microbially Induced Sedimentary Structure (MISS01)
Notes specific to this specimen: Incredible specimen! This strange and unique material was discovered years ago when our associate Glen Rockers was visiting a small quarry in Oklahoma. He excavated half a dozen slabs before the quarry worked through the area and the layer was destroyed. Most of the specimens were donated to museums, including one we gave to the Smithsonian in 2024 and another to the Florida Museum of Natural History in 2025.
HOW THEY FORMED
This MISS structure formed when microbial mats, composed primarily of bacteria and algae, colonized the sandy sediments of a coastal environment approximately 305 million years ago. The microbes secreted sticky extracellular substances that bound sand grains together, stabilizing the sediment surface against currents and waves. As sediment accumulated, microbial growth, mat shrinkage, and interactions with moving water produced the complex ridges, wrinkles, and convoluted wavy patterns preserved in the rock. Burial beneath subsequent layers of sediment protected the structures from erosion. Over time, compaction and cementation transformed the sand into Hartshorne Sandstone, preserving this fossilized record of microbial activity in an ancient environment.SIZE: 28″ x 40″ x 1.5″
SHIPPING: If you cannot pick up the specimen in person, additional crating and shipping charges will apply. Please contact us for details.
Documentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$6,800.00 -
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 -
Minnesota Thomsonite (MNT002)
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 three very bright, large nodules exposed with high polish on the front face. They could be removed and cut for jewelry.
Size: 3″ x 4″ 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:
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.
$485.00Minnesota Thomsonite (MNT002)
$485.00 -
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 -
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 (MNT13)
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. Front polished face has multiple Thomsonites. Back and sides are rough.
Size: 3″ x 3″ x 2.5″
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.
$65.00Minnesota Thomsonite (MNT13)
$65.00 -
North American Rift (RIFT1)
Notes specific to this specimen: Great jagged healed fractures! Beautiful white quartz and citrine infilling mixed with a hint of green fluorite in the fractures of jet-black Rove Formation. Cut front face has a nice smooth satin finish. This specimen is a “stand-up” with a cut flat bottom, allowing it to sit upright to show off the display face. Back is naturally rough.
SIZE: 3″x 3″x 2″
Minerals: White Quartz, Citrine, Fluorite
Age: Mesoproterozoic Era – 1.1 billion years
Unit: Rove Formation
Site: Cerdito Prospect, Thunder Bay, Ontario, Canada
Collected: 2025
By: Jon & JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$185.00North American Rift (RIFT1)
$185.00 -
North American Rift (RIFT102)
Notes specific to this specimen: Several very fine healed fractures. Beautiful white quartz and citrine infilling in the fractures of jet-black Rove Formation. Cut front face has a nice smooth satin finish. This specimen is a “stand-up” with a cut flat bottom, allowing it to sit upright to show off the display face. Back is a cut face also showing nice bifurcations. Edges are naturally rough.
SIZE: 2.5″x 2.5″x 1″
Name / Species: White Quartz, Citrine
Age: Mesoproterozoic Era – 1.1 billion years
Unit: Rove Formation
Site: Cerdito Prospect, Thunder Bay, Ontario, Canada
Collected: 2025
Collected by: Jon and JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$65.00 -
North American Rift (RIFT103)
Notes specific to this specimen: Cut wedge-shape has great jagged healed fractures! Beautiful white quartz and citrine infilling the fractures of jet-black Rove Formation. Cut front face has a nice smooth satin finish. This specimen is a “stand-up” with a cut flat bottom, allowing it to sit upright to show off the display face. Back is naturally rough.
SIZE: 2.5″x 2.5″x 2″
Name / Species: White Quartz, Citrine
Age: Mesoproterozoic Era – 1.1 billion years
Unit: Rove Formation
Site: Cerdito Prospect, Thunder Bay, Ontario, Canada
Collected: 2025
Collected by: Jon and JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$65.00 -
North American Rift (RIFT104)
Notes specific to this specimen: Several very fine healed fractures. Beautiful white quartz and citrine infilling in the fractures of jet-black Rove Formation. Cut front face has a nice smooth satin finish. This specimen is a “stand-up” with a cut flat bottom, allowing it to sit upright to show off the display face. Back is a cut face also showing nice bifurcations. Edges are naturally rough.
SIZE: 2.5″x 2.5″x 1″
Name / Species: White Quartz, Citrine
Age: Mesoproterozoic Era – 1.1 billion years
Unit: Rove Formation
Site: Cerdito Prospect, Thunder Bay, Ontario, Canada
Collected: 2025
Collected by: Jon and JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$65.00 -
North American Rift (RIFT2)
Notes specific to this specimen: This is a very 3-D piece with front and bottom sawn and smooth, while the rest is natural rough. Beautiful citrine and smoky quartz infilling the fractures of jet-black Rove Formation. Some small crystal-lined cavities. Cut front face has a smooth satin finish. This specimen is a “stand-up” with a cut flat bottom allowing it to sit upright to show off the display face. Back is naturally rough.
SIZE: 3″x 3″x 2″
Minerals: White Quartz, Citrine, Fluorite
Age: Mesoproterozoic Era – 1.1 billion years
Unit: Rove Formation
Site: Cerdito Prospect, Thunder Bay, Ontario, Canada
Collected: 2022
By: Jon & JulieDocumentation: This authentic fossil specimen comes with a Certificate of Authenticity and Origin.
$165.00North American Rift (RIFT2)
$165.00
