Colorless, translucent to transparent hydroboracite crystals to 1.5 cm on an anhydrite (?) matrix. A 2.3 cm wide patch of clear gypsum (variety selenite) is present near the edge of the specimen. Since I haven't type a chemical formula in awhile, I'll remind you that hydroboracite is a hydrated calcium magnesium borate - CaMg[B₃O₄(OH)₃]₂·3H₂O. An affordable example for the species/locality. A handwritten note accompanying the specimen notes the sample is from the 2nd level and gives a date of December, 2012. Previous dealer label with a $30 price.