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\u201cThe Stayish black opal mine, active since 2013, is located in the Wollo province of northern Ethiopia,\u201d wrote Dr. Lore Kiefert, chief gemologist.\u00a0<\/p>\n
She works at G\u00fcbelin Gem Lab (GGL<\/a>), where her research focuses on gemstone origin and advanced laboratory characterization.<\/p>\n Her team describes<\/a> a distinct opal-bearing clay layer about 2-feet thick that tracks the mountain belt for many miles.\u00a0<\/p>\n Local villagers practice artisanal mining, which is hand-dug family-run mining work, cutting tunnels 50 to 65 feet into the hillside along the seam.<\/p>\n Most opal pieces pulled from the layer are small nodules barely an inch across, with rare chunks stretching close to 4-inches long.<\/p>\n White, crystal, and black opals<\/p>\n Early mining in the 1990s at Mezezo brought nodules of orange precious opal, transparent opal with bright color flashes, but not black stones.<\/p>\n In 2008 miners near Wegel Tena in Wollo uncovered white and crystal opal from volcanic rocks, now studied<\/a> as Ethiopian material.\u00a0<\/p>\n That white Wollo opal often behaves as hydrophane, porous opal that soaks water, enabling gem treaters to experiment<\/a> with dye effects.\u00a0<\/p>\n Before Stayish, researchers documented<\/a> an Ethiopian black opal whose bodycolor came from manganese-rich minerals, underlining how rare dark material was.\u00a0<\/p>\n Horizontal tunnels cut into the slope<\/p>\n Once a promising spot is found, crews swing pickaxes along the clay horizon, hauling bucket after bucket of rock out through the entrance.<\/p>\n Inside those tunnels, the ceiling can hang low over earth, and miners rely on timber props and experience rather than machinery for support.<\/p>\n Many villagers farm during the rainy season, then spend dry months underground hoping stones will bring cash for school fees or tools.<\/p>\n When a patch of color appears in the wall, miners switch to small chisels and water and ease the opal out carefully.<\/p>\n Thin clay black opal layer<\/p>\n Geologists see the Stayish opal in a stratum, single rock layer marking the boundary between volcanic rock and clay sediments where miners dig.<\/p>\n The layer lies between volcanic ash and ignimbrite, hardened rock<\/a> from once fast-moving ash flows, across a wide region.<\/p>\n Field crews have traced this opal layer along the highlands for dozens and possibly hundreds of miles, revealing a surprisingly continuous geological target.<\/p>\n Within that clay, some pockets carry play of color while others hold common opal, dull opal lacking strong color flashes.<\/p>\n Ethiopian black opal is different<\/p>\n The Stayish stones show a natural dark bodycolor that resembles treated material, yet surfaces stay clean with no staining in pits or scratches.<\/p>\n When cut in sections, the black bodycolor runs all the way through pieces, sometimes layered with gray common opal that borders color patches.<\/p>\n Using X-ray fluorescence, which is a method measuring elements using X-rays, researchers measured barium from undetectable to 1,000 parts per million in these opals.<\/p>\n Unlike hydrophane white opals from Wegel Tena, Stayish black stones seldom absorb water and are often considered<\/a> more stable in finished jewelry.\u00a0<\/p>\n Treated opal and the risk of confusion<\/p>\n Treaters take advantage of Ethiopian opal, using smoke, sugar acid solutions, and dyes to turn light material into stones that resemble black opal.<\/p>\n Smoked stones leave black residue in pits and fractures, while sugar acid treated pieces may show a thin darkened rind over paler opal.<\/p>\n As demand for Ethiopian black opal has grown, a share of available stones are smoked or dyed hydrophane opal rather than dark Stayish material.<\/p>\n Buyers who want color ask for laboratory reports, test how a stone behaves in water, and look for disclosure about source and treatments.<\/p>\n Challenges of cutting black opals<\/p>\n Stayish rough often shows sharp fractures and uneven color patches, so cutters study each piece carefully before deciding how to orient a cabochon.<\/p>\n A cabochon is a type of gemstone<\/a> cut where the stone is shaped and highly polished with a convex, domed top and a flat or slightly rounded base.<\/p>\n Aggressive grinding can trigger crazing, networks of cracks from stress, so cutters keep wheels slow, use water, and tolerate breakage rates above usual.<\/p>\n Once the stone reaches a ring or pendant, careful owners avoid temperature swings, dry heat, and storage near light that can strain opal.<\/p>\n Although Stayish opal usually resists water, its background shows wear, so owners favor soap, lukewarm water, and a cloth instead of ultrasonic cleaning.<\/p>\n Reshaping the black opal market<\/p>\n Collectors once relied on Lightning Ridge in Australia for black opal, but Stayish material offers a growing second source with its own look.<\/p>\n As word spreads, Stayish gemstones still sell for less than many Australian blacks, while top stones showing bright multi-colored flashes command collector prices.<\/p>\n Jewelers are pairing Ethiopian black opal with gold, leaning into color patches and patterning that differ from narrow flashes seen in Australian stones.<\/p>\n Stories about the gems<\/a> highlight origin, describing Ethiopian black opal mined by hand from tunnels cut by villagers instead of from open pits.<\/p>\n Local opportunity, long-term care<\/p>\n The Stayish discovery has brought cash and visitors into Wollo villages, yet earnings remain uneven and depend on a few finds each season.<\/p>\n Geologists and officials working with cooperatives can help by encouraging safer tunnel designs, adding timber supports, and creating channels that reward miners.<\/p>\n Collectors and dealers influence conditions when they ask detailed origin questions, support transparent supply chains, and favor partners working directly with village miners.<\/p>\n That black opal seam beneath Wollo now links tunnels, gem labs, and jewelry counters in ways few villagers imagined when they began digging.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Far above northern Ethiopia\u2019s patchwork fields, villagers in Wollo have uncovered a rich, natural black opal deposit almost…\n","protected":false},"author":2,"featured_media":2546,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[65,759],"class_list":{"0":"post-2545","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-ethiopia","8":"tag-ethiopia","9":"tag-science"},"share_on_mastodon":{"url":"","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/posts\/2545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/comments?post=2545"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/posts\/2545\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/media\/2546"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/media?parent=2545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/categories?post=2545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/africa\/wp-json\/wp\/v2\/tags?post=2545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}