Geode Haiku

I have this really cool purple geode that I used today with my tutoring students to help get them writing detailed descriptions. After the session, I wrote some haiku - in the Kerouacian, no-syllable-rule style - inspired by said geode. My three favorites:

Purple claws
    a dusky shell
Evening underground

Inky effusions
    too thick
To have color

Timid but expectant
    the crystalline mouth
Half-open