Objective: To provide references for clinical medication safety of Calcitum by analyzing its pharmacgnosical properties. Method: Calcitum samples were collected and its species was classified and identified by macroscopic identification

and its ore stone mill piece was identified by microscopic identification.The content of CaCO3 in Calcitum were measured by ethylenediamine tetraacetic acid disodium salt titration method.Main phase and mineral elements content were assayed and calculated by X-ray power diffraction(XRD) and inductively coupled plasma optical spectrometer(ICP-OES). Result: Though identification of morphology

samples were divided into 3 groups and rock types were identified as calcite marble.The mass fraction of CaCO3 was between 88.90%-97.08% in samples.It was found that there were three batches of samples with higher of heavy metals and harmful elements which mainly were As and Hg in nine batches of samples than limits.Among all samples

six batches of samples with higher of As

one batch of samples with higher of Cd and six batches of samples with higher of Hg than limits. Conclusion: According to these results

the content of CaCO3 in Calcitum shall not be less than 92%.Analysis of elements shows that only Calcitum Ⅰ reached the standard of Medicinal Plants and Preparations for the Green Trade Standard

it can lay foundation for safe use and quality evaluation of Calcitum.