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A Cold Lake Lowell Rockhunt!
Lake Lowell Rockhunt?
Plume botryoidal chalcedony nugget!
Plume slice!
Botryoidal slice!
Plume agate inspection!
Plume flow!
Botryoidal Chalcedony Nugget!
Salmon Falls Creek Reservoir!
Playing with color!
Plume chunk glow!
Red dot glow slice!
Glow plume!
Carnelean Glow!
Jasper glow!
Glow Plume!
Thundercup glow!
Thunderegg glow!
Plume chunk glow!
Slab o' Plume Glow!
Glow chunk!
Plume agate glow!
Rabbit Springs Lava Flow!
Broken Geodes & Thundereggs!
Whole Thundereggs from Rabbit Springs Lava Flow!
Thunderegg Nest!
Snake River Canyon! (near the Evel Knieval jump)
The green caught my eye!
Square geode!
Big ol' chunk!
Beautiful dark opal!
Hot Botryoidal Mess!
Plume agate!
A Bit o' Honey Plume Agate!
Brecciated jasper!
Plume agate!
Alien egg!
Half of a geode!
It's curved!
Plume Agate!
Botryoidal formations!
Carnelian sandwich!
Broken geode!
This half survived Monther Nature!
Plume agate!
Beautiful Colors!
Jasper, Chalcedony, Opal & ???
Cool Banding!
Rockhunting at Graveyard Point!
Broken nodule!
Big Red!
Nodule with crystals!
Chalcedony or Opal!?
Quartz Nugget!
Crushed Thunderegg!
Tri-cluster of Thundereggs!
Big Green!
Chalcedony!
Boise River Rockhunting!
Lava Rock!
Carmel Chalcedony Nugget!
Cracked Up Quartz!
Cool Nodule!
Smooth as Glass!
Did you see the little X?
Pink Quartz!
Crisscross Iron Stained Quartz!
Tiny Thundereggs!
Clear/White Banding!
Circular Formation!
What's inside this Thunderegg?!?
Is it a Thunderegg?
Cross section cut!
Beautiful Colors!
Pink n' White Inside!
Alien Egg!
There's this!
Love the orange/yellow!
Interesting!
Chocolate!
Quartz and...
Cool Staining Pattern!
Beautiful Colors!
Now that's a big gash!
One 4 cuttin'!
This one got a swirley!
X marks the spot!
Beautiful Opal Glow!
Nice cut!
Agate nodule!
One to cut!
White botryoidal chalcedony?
Got a little cave in it!
Orangey!
Interesting form!
Agate w/Orange Chalcedony!
Smooth Shard!
Cool Banding!
Spud 2!
Nice Glow!
Half Glow!
Banded Glow!
Bright White!
Glow Blob!
Quartz and ?
Lil' bit of opal!
Should be a pretty glow! Stay tuned!
Yella Quartzite!
Beautiful Quartz!
Did you catch the silver flakes?
No idea!
Bright Orange Jasper Nodule!
Beautiful Jasper!
Layers!
Jasper Banding!
Colorful!
Opal!
Purple & Yellow Jasper!
Opal or Chalcedony?
Chalcedony & Jasper!
Part of a Thunderegg!?
Spud 3!
Beautiful Quartz!
Beautiful Yellow Quartz!
Jasper Nodule?
Agate Stone w/Yellow Chalcedony!
Quartz Shard!
Grey Quartz!
Rockhounding at Lucky Peak Reservoir!
Agate Nodule!
Beautiful Quartz!
Blue/Grey Quartzite!
Quartz Nugget!
Agate Nodule!
Yellow Chalcedony!
White Quartz Shard!
Beautiful Yellow Quartz!
Coral Fossil!
Petroskey stone?
Dinosaur Egg!
Pink!
Mish Mash of Agate!
Yellow & White Chalcedony!
Agate Nodule w/Chalcedony!
Colorful Jasper!
Yellow/Green Jasper!
Contrasting colors!
Sandwich o' Chalcedony!
Colorful Jasper!
Chalcedony Sqared!
Chalcedony Blob!
Stunning Colors!
Pinks & Reds!
Beautiful! Wait for it!!!
Agate & Quartz!
Quartz!
Iron Stained Quartz!
Quartz!
Beautiful!
White/Grey Quartz!
Nice!
Mostly Quartz!
Beautiful Quartz!
Quartz Nugget!
Beauty!
Chalcedony?
Purdy!
Chalcedony!
Iron Stained!
Quartz or Chalcedony!?!?
Chalcedony from a Thunderegg!
Quartz +!
Chalcedony!
Yellow Quartz!
Quartz n' Iron!
Rose Quartz!
Indian Creek, ID
Big ol' Nodule!
Pretty Colors!
Interesting!
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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