Types of Keokuk Geodes 

Definitions: What does that mean?

Barrel : cylindrical container, ex: battery

Botryoidal : shaped like a bunch of grapes, ex: smooth lava

Capillary : resembling a hair, ex: eyelash

Cubic : equal sided square, ex: pair of dice

Drusy :  wall lined with crystalline euhedra, ex: frozen dew on a leaf

Euhedral : composed of tiny crystals, without an exposed crystal face, ex: an onion skin

Ferroan : rich in iron, ex: rusty car fender

Filiform : hail-like, similar to capillary, but with multiple growth angles, ex: tree branch

Iridescent :  hue changes according to the angle from which the surface is viewed, ex: oil on the road after a rain

Pagoda : a tiered tower with multiple eaves, ex: Asian or Chinese hut

Reticulated : to form a net or network, ex: TV antenna on your roof

Rhombohedron (Rhomb) :   a square that has been deformed in only one direction, ex: partially squashed box

Scalenohedral : resembling the shape of a dog's tooth, ex: a dogs open mouth

  Picture with type below.

Solid Geode with exterior covered with Iron Pyrite

Crystal Clear Selenite on Brown Calcite

Sphalerite on Quartz

Iridescent Brown Calcite

Pagoda Calcite  Close-Up #2

Goethite on Quartz

Smokey Quartz Snowball (Best one I've seen)

More Close-Ups: 2 - 3 - 4

Red Quartz Geode

Pink Dogtooth Calcite

Phantom Calcites on Drusy Quartz  Close-up #2

 Blue Barite Rosette on Botryoidal Chalcedony

Aragonite needles on Euhedral Chalcedony 

Chalcopyrite on Quartz

Kaolinite after Calcite 

 Marcasite (reticulated)

Yellow Barite on Quartz

Malachite (small green crystals), Close-up #2

*The above photo/specimen is from the collection of Ken Vaisvil. Thank you.

Capillary pyrite (very fragile) Close-up #2

Barrel Calcite   

Pink Calcite on chalcedony 

Drusy Quartz

Citrine Quartz

Multi-chambered

Smokey Diamond Dewdrop

Oil Geode

Diamond Dewdrop

Quartz geode (simple, yet pretty)

Really big geode, 90+ pounds

Pyrite cubes on quartz

Ferroan Dolomite (ankerite) on quartz

Kaolin or Kaoline (white powder)

Infused capillary hematite (growing in and through the calcite crystals) similar phenomenon to rutilated quartz

Onion skin, pale coating (euhedral chalcedony covering the quartz)

Aragonite (fluorescent under short and long wave UV light) Sorry for the blurry close-up.

More coming soon . . . 

 Black Calcite (a.k.a "Kahoka Black" very rare, hunting in progress)