The ferrierite group of zeolite minerals (the FER structure) consists of four very similar species: ferrierite-Mg, ferrierite-Na, ferrierite-NH4 and ferrierite-K, based on the dominant cation in the A location. ferrierite-Mg and ferrierite-K are orthorhombic minerals and ferrierite-Na is monoclinic with highly variable cationic composition . Calcium and other ions are often also present. They are found in vitreous to pearly, often radiating, spherical aggregates of thin blade-shaped transparent to translucent crystals.
{{Infobox mineral | name = Ferrierite | image = Ferrierite-Mg-143217.jpg | imagesize = 300px | alt = | caption = Ferrierite-Mg, Kamloops Lake, British Columbia, Canada | category = Tectosilicate minerals | group = Zeolite group | formula = {{chem2|("A"position)_{3–5}Mg[Al_{5–7}Si_{27.5–31}O72]*18H2O}} | IMAsymbol = Frr | molweight = | strunz = 9.GD.50 | dana = | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Immm P21/n (Ferrierite-Na) | unit cell = | color = white, colorless, pinkish, orange to red | colour = | habit = small plates or short prismatic crystals, asbestiform needles | twinning = | cleavage = | fracture = | tenacity = | mohs = 3 – | luster = | streak = white | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references =
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).