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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!
Quartz?
Chalcedony!
#Chalcedony is a cryptocrystalline form of silica, much like chert, but it's distinguished by its fibrous microcrystalline structure. Here are the key features of chalcedony:
Composition:
Silica (SiOâ‚‚): Like chert, it's primarily composed of quartz, but the structure of the crystals is different.
Texture and Structure:
Microcrystalline: The individual crystals are too small to be seen with the naked eye.
Fibrous: Chalcedony often displays a fibrous or acicular (needle-like) structure in contrast to the more blocky or mosaic structure of other quartz varieties like chert.
Varieties of Chalcedony:
Agate: Known for its banded or layered appearance; each band often has a slightly different color.
Jasper: Similar to chalcedony but typically more opaque and can contain significant impurities like iron, giving it a wide range of colors.
Onyx: Usually refers to chalcedony with parallel bands of black and white, though the term can be misused for other banded chalcedonies.
Carnelian: A reddish variety due to iron oxide impurities.
Chrysoprase: Colored green by nickel silicate inclusions.
Bloodstone (Heliotrope): A dark green chalcedony with red spots of iron oxide or hematite.
Physical Properties:
Hardness: 6.5 to 7 on the Mohs scale, slightly softer than quartz but still quite durable.
Luster: Waxy or greasy when polished.
Transparency: Can range from translucent to nearly opaque.
Fracture: Conchoidal, similar to chert, but due to its fibrous nature, it can show a splintery fracture in some cases.
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