Tripestone
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Tripestone — is a mineral, a variety of Anhydrite which has crystallized into twisted or contorted plates which are thought to resemble Tripe, hence the name … Wikipedia
Sulfate minerals — ▪ Table Sulfate minerals name colour lustre Mohs hardness specific gravity alum colourless; white vitreous 2–2½ 1.8 alunite white; grayish, yellowish, reddish, reddish brown vitreous 3½–4 2.6–2.9 alunogen white; yellowish or reddish vitreous to… … Universalium