Pale yellow groups of tridymite crystals in a number of vesicles in basalt (dozens of clusters). Other minerals present include ilmenite and augite, and maybe hyalite opal.
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Price $3.00. Code WS0013.
Please note the size! Specimen requires magnification and illumination.
Full specimen photo: Box is 28mm square. Close up photos: Width of view 3.5mm.