While your link was interesting, it was primarily about dispelling the idea that there is actual "sand" in the wood.
As for silicon, the linked write-up does say,
"However, it remains to be determined whether or not other silicon -containing compounds, precipitated within the wood of certain trees, do play a role in making the wood harder. ".
Wikipedia says,
"
Silicon
Silicon is not considered an essential element for plant growth and development. It is always found in abundance in the environment and hence if needed it is available. It is found in the structures of plants and improves the health of plants.[31]
In plants, silicon has been shown in experiments to strengthen cell walls, improve plant strength, health, and productivity..."
https://en.wikipedia.org/wiki/Plant_nutrition#Silicon
A paper on the Chemical Composition of Wood states,
"The principal inorganic compounds present in wood are sulphates, phosphates, chlorides, and silicates of potash, calcium, and magnesium, and frequently nitrates of these latter elements...."
http://www.booksupstairs.com/Wood-...-materials/Chemical-Composition-of-Woods.html
A paper entitled, "Which Abrasives to Use", lists calcium silicate as an abrasive.
http://www.keyabrasives.co.uk/which-abrasive-to-use/4562724426/#natural-abrasives
I'm not saying osage or locust contains calcium silicate but if it does it could help explain its abrasive qualities on saw blades and other cutting tools. :hmm: