Phosphosiderite is a relatively rare mineral that can only be found in a few locations worldwide. A naturally occurring form of iron phosphate, the stone's colour can vary depending on where in the world it was mined. Although used as a decorative material, phosphosiderite is relatively soft and brittle which makes it particularly difficult to work with.
The name metastrengite was once used but is now obsolete. Phosphosiderite comes from 'phospho' (from phosphate) and 'siderite' from the Latin 'sídēros' meaning iron.
Phosphosiderite crystals can occur in shades of reddish-orange or hues of purple. They tend to be very small and are extremely rare. The crystal habit of material used for decorative purposes is massive. Crystals in this habit grow in large masses with no visible external shape or structure.
We have not been able to find any factual geological information regarding the stability of the colour of the mineral phosphosiderite. For this reason if using these tumbled stones for their metaphysical properties, we recommend being careful with regards to exposure to bright sunlight for any length of time. Many minerals fade or change colour completely when exposed to sunlight, citrine and amethyst are perfect examples.
Some crystal healing references recommend 'charging' crystals by placing them in the sun or in a bowl of salt water. The colour of some minerals will fade even after short exposure to sunlight whilst others do not react well to moisture. We would never recommend allowing salt which is a corrosive to come into contact with any mineral especially one that's delicate such as phosphosiderite. If you wish to charge your crystals we believe the safest way would be in the light from a full moon on a warm or mild evening.
Although classed as a medium sized tumbled stone weights and sizes of these phosphosiderite crystals varies from piece to piece. For this reason we've split them into small and medium.