Thundereggs
Nevada Black Rock
SpiritRock Shop
Rare Mossy Plume Agate Black Rock Thunderegg Slab

This is a wonderful example of the “Best of the Best” of the Nevada Black Rock Thundereggs.  This stunning large and
thick polished slab was obtained direct from the owners who mine these Thundereggs in McDermitt, Northern Nevada.  
This specimen is laced with swirls of beautiful mossy golden plume and has a window of opaque banded Chalcedony.  This
is a really rare piece, as most of the Thundereggs from the Black Rock Desert area do not have anywhere near the
amount of mossy plume that this specimen contains and are normally much smaller. This slab is nicely polished on one
face and contains natural fault cracks.
This specimen weighs 0.53 lb (243g) and measures 6 x 4 x 0.31 inches (153 x 101 x 8mm)
Item #TEBR05134456
Rare Mossy Plume Agate Black Rock
Thunderegg Slab

$125.00
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Museum Specimens
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Nevada Black Rock Desert
Some of the best and most distinctive
Thundereggs are from locations now
closed off and unavailable. In this case,
the area has been designated a
wilderness area by the Bureau of Land
Management (BLM) and closed.
Wilderness or not, the Black Rock Desert
Thundereggs are still some of our
personal favorites, for that wonderful
brick-red matrix and especially if we find a
mossy plume specimen. The Black Rock
Desert is located in the northwest corner
of Nevada, north of Gerlach and west of
Winnemucca. The lands there are all
wilderness protected areas, a few old
personal claims and Indian Reservation
areas. Some rockhounding is still
permitted with strict limitations.
Item #TEBR05131000
Black Rock Desert
Thunderegg Polished Half

$21.00
Black Rock Desert Thunderegg Polished Half

This is a typical Thunderegg from the Black Rock Desert area. This thunderegg is
nicely polished on one face and contains natural fault cracks. It displays the typical
mottled red brown outer matrix and has a window of opaque banded Chalcedony with
very faint light blue fortification lines.

This specimen weighs 7.4 oz or 0.46 lb (210g)
and measures 4.3 x 2.5 x 1" (11 x 6.5 x 2.6cm)
Item #TEBR05131434
Rare XL Black Rock Desert
Thunderegg Polished Half

$95.00
Rare XL Black Rock Desert Thunderegg Polished Half

This thunderegg is nicely polished on one face and contains natural fault cracks. It
displays the typical mottled red brown outer matrix with a botryoidal like inclusion with
wispy quartz vug and a second vug of opal in a gold/brown moss surrounding the
clear to white center.

This specimen weighs 4.7 lb (2170g)
and measures 6.5 x 5 x 3.3 inches (16.5 x 12.8 x 8.3cm)
Item #TEBR05130111
Strange Black Rock
Desert Thunderegg
Polished Half

$24.00
Strange Black Rock
Desert Thunderegg
Polished Half

This thunderegg is nicely
polished on one face and has
strange black and greenish
crystal formations in clear
crystal and smoky crystal
formations in two small vugs.
This is all framed in a deep
brick red matrix which
accentuates the whole
specimen!
Very strange piece...desert
walks will find the strange ones
for sure!

This specimen weighs
2.39 lb (1081g) and
measures 4.6 x 4.5 x 2.9"
(11.8 x 11.4 x 7.5cm)
Item #TEBR05132000
Rare Black Rock Desert
Thunderegg Polished Half

$23.00
Black Rock Desert Thunderegg Polished Half

This is a typical Thunderegg from the Black Rock Desert area. This thunderegg is
nicely polished on one face and contains natural fault cracks. It displays the typical
mottled red brown outer matrix and has a window of opaque banded Chalcedony with
very faint light blue fortification lines.

This specimen weighs 9.6 oz or 0.6 lb (274g)
and measures 4.2 x 2.6 x 1.1" (10.9 x 6.8 x 2.9cm)