Loudounite
Loudounite is an IMA-recognized mineral species in the silicate class, with the chemical formula NaCa₅Zr₄Si₁₆O₄₀(OH)₁₁·8H₂O.
Key properties: Mohs hardness 5; specific gravity 2.48; White streak.
IMA symbol Ldo, IMA status: approved, named in 1982.
A late-stage mineral in the alteration of diabase.
It is found associated with Ancylite, epidote, prehnite, chlorite, actinolite, stilbite, albite, zircon, apophyllite, apatite, titanite, quartz, calcite.
The name refers to the occurrence in Loudoun Co., Virginia, USA.
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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