Calamaite is the third natural Ti dominant sulfate mineral known yet. Russian scientists recognized this phase, occuring as filigrane colourless sprays, while doing some analytical investigations in a matrix of coquimbite / römerite. Type locality is the Alcaparrosa mine in Chile.
A recently performed EDS analysis of such sprays showed, that this is a very rare phase among pickeringite, which looks very similar.
Only a fraction of the candidates were calamaite finally.
One specimen, the only I have, is now in my auction running till Tuesday.
