Flowering Lithop

My stone plant bloomed!

First, there was a button between the two leaves, then an orange tip, then ...

First petals. October 2.

Side view, the same day.

Coming along nicely. October 4.

Full flower! October 8.

Zooming in.

Now, a week later, the flower has started to wilt. For that plant, that's it for this year; they produce, at most, one flower per plant per year.

But there's a button poking between the leaves of the plant next door! Such excitement!