Three single doubly-terminated crystals up to 1,1 cm , with an excellent definition of forms and a high degree of transparency on a Limonite matrix.
Formula :
(Ca,Mn2+[SiO3(OH)](OH)
System: orthorhombic Hardness:5 Rarity:very rare
Strunz id:VIII/B.22-25 -
SILICATES
Name origin: Named for Filippo Olmi (CNR, Centre di Studio per la Minerogenesi ela Geochimica Applicata, Florence, Italy)
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 Specimen weight:44 gr.
 Crystal size:Up 1 1,1 cm wide
 Overall size: 43mm x 26 mm x 20 mm
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