White single crystal of the extremely rare organic mineral flagstaffite from the type and only known locality worldwide in Flagstaff (Flagstaff, Coconino County, Arizona, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Flagstaffite
Flagstaffite is an IMA-recognized mineral species in the organic mineral class, with the chemical formula C₁₀H₂₂O₃.
It crystallizes in the orthorhombic crystal system (space group Fdd2).
Key properties: specific gravity 1.09; optically biaxial.
IMA symbol Fsf, grandfathered status — known before the IMA’s founding, named in 1920.
Lining cracks in decomposing buried pine logs.
The name refers to Flagstaff, Arizona, USA, near the type locality.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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