- Montgomeryite, Whitlockite, Microcline
- Cabinet, 12.3 x 4.6 x 4.6 cm
- Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
A fine cabinet specimen of rare phosphates from the famous Tip Top Mine of South Dakota. Light salmon-pink sprays of bladed montgomeryite are richly scattered and stand out on a large, well-formed microcline cleavage that is covered with drusy white whitlockite.