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Looks like a Septarian Geode. A Geode has open space inside which hasn't filled in all the way. When it fills all the way up and there is no open space it is called a Nodule. A Septarian Nodule in this case :)

Malachite Love the color...but to me, it looks like a giant broccoli spear.

Malachite-doesn't look a thing like the villain in Sailor Moon though eh lol

Lake Superior Agate - Minnesota

We have arguably the most beautiful surface found Gemstones in the world from lake Superior including Lake Superior Agate - Minnesota

The process that created the septarian nodule,  characterized by septarian concretions, remains a mystery. A number of mechanisms, i.e. the dehydra...

Septarian nodules formed between 50 to 70 million years ago. As a result of volcanic eruptions, dead sea life was chemically attracted to the sediment around them, forming mud balls. As the ocean receded, the balls dried and cracked.

Inclusions of pyrolusite and limonite in a polished slab of Brazilian agate | John Koivula | Nikon Small World

Prize - John I. Koivula Gemological Institute of America - Santa Monica, California, USA Specimen: Inclusions of pyrolusite and limonite in a polished slab of Brazilian agate Technique: Brightfield

Microscopic Photography | Basswood (Tilia) stem, sectioned and stained, 4x objective.

Chapter Biology: Photography through the microscope

Androgynoceras sp (Polished Ammonite) from Dorset, UK

UK Fossils for sale including ammonites - Fossils Direct. Fossils for sale, high quality British fossils in our on-line fossil shop, from one of the UK's leading fossil dealers.