[The Doctor crouches down and starts picking up seemingly worthless rocks]
Interesting.
Precious stones?
Very precious. In a geological sense more precious than diamonds. But I need a bigger bit- [looks further in front of him than stops mid-sentence, drops the rocks he's holding, and runs forward] Ah-ha! [picks up a larger piece of rock] Ha-ha! Ha-ha; I was right!
How modest.
Well then see what you make of it. [holds out the rock to Romana II to examine]
[runs her index finger along the rock and then licks said finger] A composite material. Gravel in a binding of possibly limestone and clay.
Limestone and clay making?
Add water, cement.
Add gravel.
[smugly] Concrete.
You know something? You've got all the makings of a first-class navvy. Concrete. Manufactured. [drops the rock]
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