Calcite measurement, Marshall 1988

Reference	Marshall, D.J. (1988). Cathodoluminescence of geological materials. London, UK: Unwin Hyman Ltd.
Material	Calcite [ CaCO₃ ] Fluorescence and birefringence of 445 nm laser in calcite crystal © Photo by Jan Pavelka (via Wikimedia Commons), CC-BY-SA 4.0
Specimen temperature	Ambient
Technique	Unknown
Line	Unspecified 605 nm

Nominal composition of Calcite [ CaCO₃ ].
Element	Atoms	At%	Wt%
Ca	1	20	40
C	1	20	12
O	3	60	48