MUMDMC2025_DataSet_sample

The <b>MUMDMC2025 </b>dataset offers a unique and systematically collected sample of microscope rock images from the Eastern Desert of Egypt (Wadi Fatira El-beida). Its distinguishing feature is comprehensive rotational imaging, capturing the full spectrum of anisotropic optical properties. Specifically, for each sample, images are acquired at 5-degree increments across complete 360-degree rotations under both Plane-Polarized Light (PPL) and Cross-Polarized Light (XPL). This detailed approach precisely documents key optical phenomena, including pleochroism variations (e.g., hornblende displaying characteristic green to brown color transitions), extinction angle progressions (e.g., plagioclase exhibiting 0°–20° extinction ranges), and complete birefringence sequences (e.g., biotite showing 0.04–0.08 birefringence variations). The dataset comprises a total of 14,400 high-resolution images, stemming from 72 rotational sequences, covering 5 distinct mineral species, observed under 2 polarization modes (PPL/XPL), and captured from 20 individual crystals. This extensive collection provides an unprecedented and comprehensive optical characterization resource for mineralogical and petrographic studies.<b>MUMDMC2025</b> 数据集收录了一套系统采集的独特显微岩石图像样本，采自埃及东部沙漠瓦迪法提拉埃尔贝达（Wadi Fatira El-beida）区域。该数据集的显著特征在于采用全方位旋转成像技术，完整捕获矿物各向异性光学特性的全部光谱信息。具体而言，针对每个样本，数据集在平面偏振光（Plane-Polarized Light, PPL）与正交偏振光（Cross-Polarized Light, XPL）两种成像模式下，对样本完成360°全角度旋转拍摄，拍摄步长为5°。这套精细的拍摄方案精准记录了核心光学现象，包括多色性变化（例如角闪石呈现典型的绿至棕颜色转变）、消光角变化（例如斜长石的消光角范围为0°至20°）以及完整的双折射率序列（例如黑云母的双折射率变化区间为0.04至0.08）。本数据集总计包含14400张高分辨率图像，源自72组旋转拍摄序列，涵盖5种不同矿物，采用2种偏振模式（PPL/XPL）拍摄，对应20颗独立晶体样本。该大规模数据集为矿物学与岩石学研究提供了前所未有的全面光学表征资源。