©
finnchaga: Pseudo uniaxial light-colored phlogopite from Parainen
©
finnchaga: Conoscopy of "lepidolite"
©
finnchaga: Mica without and with quarter-plate
©
finnchaga: Viitaniemi zoned muscovite "optics"
©
finnchaga: conoscopic practise No. 1 -Quartz
©
finnchaga: "Biotite"
©
finnchaga: Topaz chip from Kotka
©
finnchaga: Dark phlogipite from Parainen