@Gabler You're quite right, I thought the same at first (about a year ago), but as
@Contact said it is a silicate product, 45%silicon dioxide
"RAW Silica contains 45% Silicon Dioxide which is the highest concentration of silicon dioxide available to the home gardener. RAW Silica is flowable and suspend-able in water and naturally available to the plant. Since RAW Silica is a natural form of silicon dioxide, it is PH neutral and does not cloud when added to water. RAW Silica can be used during all stages of growth and bloom for optimal stem and cell wall strength. It is a beneficial supplement to all feeding schedules.
Works in conjunction with all nutrient and feeding programs."
apparently it is common to call silicon products silica, I spent a while trying to find the difference a while ago but it went over my head so thank you for bringing it back up!
Here is a pic of the one I use
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As I say its early days but I have noticed good effects particularly this tree I believe to be Orange dream and my Shin deshojo both have absolutely no shelter and we have had serious winds,
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Thank you for taking an interest!