“An elongated andalusite (var. chiastolite) crystal, with remnants of silvery schist on the outer surfaces. One end has been sawn and polished to highlight the cruciform twinning running through the length of the crystal. Ex Tom Penney collection. 8.6 x 3.1 x 3.1 cm. Henry Minot photo & collection.”

“An elongated andalusite (var. chiastolite) crystal, with remnants of silvery schist on the outer surfaces. One end has been sawn and polished to highlight the cruciform twinning running through the length of the crystal. Ex Tom Penney collection. 8.6 x 3.1 x 3.1 cm. Henry Minot photo & collection.”