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The Largest Recorded Fine Black Opal Nodule—"Halley's Comet"—Listed in the Guinness Book of World Records

The Largest Recorded Fine Black Opal Nodule—"Halley's Comet"—Listed in the Guinness Book of World Records

This Ethiopian opal makes me want a chocolate, creme-filled Cadbury Egg.

Ethiopian Opal Geode

This Ethiopian opal makes me want a chocolate, creme-filled Cadbury Egg.

The 2000 carat “Halley’s Comet” Opal - Listed in the Guinness Book of World Records as the largest uncut Black Opal nodule. Found at Lightning Ridge, Australia in 1986

The 2000 carat “Halley’s Comet” Opal - Listed in the Guinness Book of World Records as the largest uncut Black Opal nodule. Found at Lightning Ridge, Australia in 1986

Opal (var. Crystal Fire Opal) from 570 km north of Addis Ababa, Wello (Wollo), Delanta Plateau, Tigray, Ethiopia

Opal (var. Crystal Fire Opal) from 570 km north of Addis Ababa, Wello (Wollo), Delanta Plateau, Tigray, Ethiopia

Australian Opal Large nodule containing a zone of precious opal, primarily in blues and purple and green colors. From the Matthew Webb Collection

Australian Opal Large nodule containing a zone of precious opal, primarily in blues and purple and green colors. From the Matthew Webb Collection

A nodule that was cut in half and polished to exhibit beautiful blue Turquoise in different patterns.  Most Turquoise is blue-green. This Turquoise from Kazakhstan has a true blue color, with lighter and darker hues

A nodule that was cut in half and polished to exhibit beautiful blue Turquoise in different patterns. Most Turquoise is blue-green. This Turquoise from Kazakhstan has a true blue color, with lighter and darker hues

Boulder Opal is precious opal, which occurs in deposits within weathered sedimentary rocks of the Cretaceous age. It forms as a result of silica-solution seeping into spaces in an iron rich type of sandstone, called ironstone, & then solidifies. These spaces could be large & flat, which lead to flat, clean-faced opals (boulder-opal); or the spaces could be very small & scattered in an attractive pattern throughout an ironstone nodule which leads to o typical Koroit or Yowah-nut type opals.

Boulder Opal is precious opal, which occurs in deposits within weathered sedimentary rocks of the Cretaceous age. It forms as a result of silica-solution seeping into spaces in an iron rich type of sandstone, called ironstone, & then solidifies. These spaces could be large & flat, which lead to flat, clean-faced opals (boulder-opal); or the spaces could be very small & scattered in an attractive pattern throughout an ironstone nodule which leads to o typical Koroit or Yowah-nut type opals.

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