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Plume Agate with Brecciated Jasper!

Holy Jasper!

Rockhounding at The Graveyard!

Graveyard Point Rockhunt!

Beautiful day at The Graveyard!

Jasper nugget cut!

Beautiful!

Brecciated Jasper w/Chalcedony!

Jumpin' Jasper!

Brecciated Jasper!

Botryoidal Chalcedony n' Jasper Glow!

Brecciated Jasper!

Jasper!

Leopard skin Jasper!

Big Jasper!

Brecciated Jasper Cut!

Brecciated Jasper Cut!

Brecciated Jasper Cut!

Jasper Cut!

Leopard skin Jasper Cut!

Agate n' Brecciated Jasper!

Jasper w/iron inclusions!

Big Daddy!

Brecciated Red Jasper!

Breccia!

Blob o' Jasper!

Breccia!

Jasper chunk!

Jasper!

Jasper chunk!

Breccia!

Red eye!

Interesting chunk o' Jasper!

Yellow Jasper!

Bruneau Jasper!

Brecciated Red Jasper Cut!

Pretty Yellow Inside!

Brecciated Jasper Cut!

Brecciated Ball of Jasper Cut!

Brecciated Jasper Cut!

Jasper glow!

The green caught my eye!

Brecciated jasper!

Beautiful Colors!

Jasper, Chalcedony, Opal & ???

Cool Banding!

Smooth as Glass!

Beautiful Colors!

Solid Color Inside!

Bright Orange Jasper Nodule!

Beautiful Jasper!

Layers!

Jasper Banding!

Colorful!

Purple & Yellow Jasper!

Chalcedony & Jasper!

Jasper Nodule?

Colorful Jasper!

Yellow/Green Jasper!

Colorful Jasper!

Pretty Red Jasper!

Solid Color Inside!
A nodule in geological terms refers to a small, irregularly rounded mass of a mineral or mineral aggregate that has a contrasting composition from the host rock in which it is found. Here are some characteristics and types of nodules:
Composition: Nodules can be composed of various minerals. Common examples include:
Concretions: Often made of minerals like calcium carbonate, iron oxide, or silica. They form by the precipitation of minerals around a nucleus (like a shell, bone, or other debris).
Chert Nodules: These are primarily made of microcrystalline quartz, silica, or opal, often found in limestone or chalk.
Manganese Nodules: Found on the ocean floor, these are rich in manganese and other metals like iron, nickel, copper, and cobalt.
Phosphorite Nodules: These contain high amounts of phosphate minerals, often found in marine sediments.
Formation:
Nodules generally form through diagenesis, the process where sediments are compacted and cemented into rock. The minerals precipitate out of solution around a nucleus, growing over time.
They can also form due to chemical reactions in the sediment or rock, often under conditions where there is a change in the chemistry of the surrounding environment.
Appearance: Nodules are typically hard, with a more or less spherical or elliptical shape, but they can be quite irregular. They often have a smooth surface and might be colored differently from the surrounding rock due to their different mineral composition.
Geological Context: Nodules can occur in various rock types, including sedimentary rocks like limestone, shale, and sandstone. They are particularly common in marine deposits where conditions are favorable for the precipitation of minerals.
When discussing nodules, it's important to specify the type because "nodule" is more a description of form and occurrence rather than a specific rock or mineral type. If you have a specific nodule in mind or find one, examining its composition and the context in which it's found will help in identifying what kind of nodule it is.
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