|Chromian diopside (emerald green) with pyrope and almandine garnet collected from anthills in the |
Green River Basin of Wyoming. One pyrope(center), was faceted.
|Artist's cartoon of a kimberlite|
pipe in cross section. When such
volcanoes contain diamond, they
can be worth $billions of dollars.
More than 100 such pipes and dikes
have been found in Colorado &
Wyoming with diamonds and
|The maar volcano at the Maxwell kimberlite (Colorado) shows a |
distinct shallow depression with different vegetation than the
surrounding granitic country rock.
|In this aerial photo, large cryptovolcanic structures occur in a field of >50 probable kimberlite|
pipes I discovered a few years ago. Several million people drive by these every year not paying
realizing they are driving next to some probable diamond mines along I-80! The white color in the
depressions is calcium carbonate. Due to CO2 gas, much of it becomes fixed as calcium carbonate
upon cooling. Country rock surrounding these depressions is dominated by silicate minerals with
no obvious source of calcium carbonate. Over the past few years, nine similar districts that include
a few hundred similar cryptovolcanic structures – nearly all are unexplored were found.
|Emerald green chromian diopside surrounded by pyrope garnets. This|
material was collected from anthills in Butcherknife Draw south of Green
River, Wyoming and later faceted in Sri Lanka.
|Parcel of gemstones from the Sloan 1 and 2 kimberlites (Colorado) that includes pyrope garnet |
(purple to red) spessartine garnet (orange) and high-quality transparent emerald-green
|Kyanite eclogite nodule from the Aultman 2 kimberlite, Wyoming. Note|
the green chrome diopside, gem-quality blue kyanite, and glassy garnet.
|A 2-inch long chromian diopside megacryst found in Sloan 2 kimberlite in Colorado by the author.|
|Facet-quality chromian diopside, pyrope garnet, almandine garnet and spessartine garnet collected from anthills in the|
the Butcherknife Draw region of the Green River Basin (Wyoming) by the author.
|Chromian diopside cross with white topaz|
|Chromian diopside showing two directions of cleavage, collected|
from kimberlite in the Colorado-Wyoming State Line diamond
district by the author.
|Chromian diopside in limonite-rich seam in a serpentinite from northern California collected in the Hayfork area by|
|Very large diopside megacryst crystal found in a Wyoming kimberlite by the author. Note the presence of parting (cleavage) planes.|