Med-City Calcite from Rochester, MN

Contributed by: Simone Conti
minID: 3U5-A53
Date: Sep 29th, 2026
Locality: Rochester, Olmsted County, Minnesota, USA (See on Mindat)
Size: 12 x 7 x 17 cm

Description:
A big chunk of calcite, with some interesting colors under midwave UV light: form yellow to orange and red to violet!
This material is currently being marketed as “Med-City Calcite”. It is said to be coming from the excavation works for the Mayo Clinic expansion currently undergoing in Rochester (2025/2026).

Fluorescence under midwave UV light.

Normal light.

Summary of luminescence responses:

Calcite (Mindat) (RRUFF)

• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Yellow
• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Orange
• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Red
• Fluorescence under Midwave (305nm Lamp/Mercury) UV light: Violet