7102 Tridymite, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany October 5, 2019 Steve Europe Germany ex Joan Lamond Collection
Co. Antrim Northern Ireland United Kingdom 4822 Tridymite, Tardree Mountain, Co. Antrim, Northern Ireland October 5, 2019
Australasia New Zealand 4404 Osumilite-(Mg), Hematite, Tridymite, Hendersons Quarry, Mt Ngongotaha, North Island, New Zealand November 15, 2018
North and Central Americas Oregon United States 5510 Ilmenite, Enstatite, Summit Rock, Klamath Co., Oregon, USA October 5, 2019
