Thomsonite from Lomba dos Pianos quarry, Portugal

Thomsonite from Lomba dos Pianos quarry, Magoito, São João das Lampas e Terrugem, Sintra, Lisbon, Portugal

Thomsonite specimens from the Lomba dos Pianos quarry, which I think roughly translates to 'hill of pianos'.

Thomsonite is a mineral group containing two members - Thomsonite-Ca and Thomsonite-Sr; when analysis hasn't been completed, we just refer to them as 'Thomsonite'.

It often occurs as radial aggregates, with fine fibrous crystals splaying outwards from the centre.