AGATESANDJASPERS.COM
JASPERS 2

The first genetic classification of jaspers (by M. Campos-Venuti 2010).


2-VOLCANIC JASPERS
Volcanic Jaspers form by silicification of volcanic rock, usually rhyolites.

Geological setting of Volcanic Jaspers (by M. Campos-Venuti 2012)
 

Stratified Jaspers
Stratified Jaspers form from distal volcanic ash beds and represent most of the landscape jaspers.

Field appearance of a Stratified Volcanic Jaspers (by M. Campos-Venuti 2012)


Biggs Jasper, Sherman County, Oregon.

You can learn about the origin of volcanic jaspers in the Marco Campos-Venuti book:
"Genesis and Classification of Agates and Jaspers: a New Theory"
that you can buy here.


Chicken Track Jasper, McDermitt area, southern Oregon.


Palomino Jasper, McDermitt area, southern Oregon.


Cripple Creek Jasper, Malheur County, Oregon.


Succor Creek Jasper, Malheur County, Oregon.

Massive Jaspers
Massive Jaspers form from volcanic tuffs near fumarolic activity.

Field appearance of a Massive Volcanic Jaspers (by M. Campos-Venuti 2012)


Noreena Jasper, Pilbara Region, Western Australia..


Exotica Jasper, Sonora, Mexico.


Hickorite, Montana.


Salina Wonderstone, Soldier Canyon, Sevier County, Utah.

Rhyolitic Jaspers
Rhyolitic Jaspers form from devitrification of volcanic lava flow.

Field appearance of a Rhyolitic Volcanic Jaspers (by M. Campos-Venuti 2012)


Bird's Eye Rhyolite, Mexico.

You can learn about the devitrification of volcanic glass in the Marco Campos-Venuti book:
"Genesis and Classification of Agates and Jaspers: a New Theory"
that you can buy here.


Spiderweb Jasper, Silver City Formation,Oregon.


Lilypad Jasper, Madras, Oregon.


Leopardskin Jasper, Mexico.


Starburst Jasper, Mexico.


Dalmatian Jasper, Mexico.

Orbicular Jaspers are a variety of Rhyolitic Jaspers formed by devitrification of obsidian lava flows.


Ocean Jasper, Marovato, Ambolobozo Peninsula, North-West Madagascar.

You can learn about the origin of orbicular jaspers in the Marco Campos-Venuti book:
"Genesis and Classification of Agates and Jaspers: a New Theory"
that you can buy here.


Ocean Jasper, Marovato, Ambolobozo Peninsula, North-West Madagascar.


Morgan Hill Poppy Jasper, California.


Guadalupe Poppy Jasper, California.


Mariposa Poppy Jasper, California.


Rose Eye Jasper, Skull Creek, Malheur County, Oregon. It shows incipient cracking.


Rain Forest Jasper from Mt. Hay, Queensland, Australia.

Thunder Eggs are a variety of Rhyolitic Jaspers formed by devitrification of glass in volcanic tuffs.
(We consider here only the outer carapace, not the filling of the cavity)


Butterfly Jasper from Mexico.


Butte Creek Jasper, Desert Dog Mine, Harper, Oregon.

You can learn about the origin of thunder eggs in the Marco Campos-Venuti book:
"Genesis and Classification of Agates and Jaspers: a New Theory"
that you can buy here.


Opal Creek Jasper, Oregon.

This and much more in the Marco Campos-Venuti book:
"Genesis and Classification of Agates and Jaspers: a New Theory"
that you can buy here.