Repost of orange/red crystal (with pictures). Possibly Oregon Fire Opal : r/whatsthisrock
Red Mexican Fire Opal — Hughes Bosca
5mm Black Trillion Opal with Red Fire - Kyocera
Fire Opal, Polished, 2 grams (Mexico #E0614)
Black ceramic ring with red fire opal and glowstone inlay. Black ceram – Orth Custom Rings
Amazon.com: 8X10mm fire Opal Cherry Opal red Stone Loose Beads Gemstones Oval Shape Flat Base cabochon Created Gemstone for Jewelry Making DIY : Arts, Crafts & Sewing
Fire Opal Gem Guide and Properties Chart
Fire Opal Necklace Black Opal Pendant Gold Opal Jewelry Red - Etsy
Mexican Red Fire Opal natural nodule Queretaro Mexico 30 mm 26.8 ct | eBay