A virtual microscope resource was created when face-to-face labs were halted due to the COVID-19 pandemic in March 2020 to replicate the learning goals of an introductory petrology course on microscopy. This virtual microscope resource utilized images and videos of thin sections, as well as 3D rock models to allow students to complete labs online. It also incorporated directed questioning and feedback as would be provided by demonstrators (teaching assistants) in a face-to-face lab. Insights obtained from student reflective questionnaires (n = 75) were used to adapt the online resource so that it could be used in conjunction with the face-to-face lab, thus becoming a blended lab resource in the subsequent year. These reflective questionnaires were utilized again to provide feedback on the revised version of the resource for blended learning. Findings showed that students in the blended learning cohort rated the quality of the available online material higher than the previous students. The blended learning cohort appreciated the immediate feedback from the resource, as well as its ability to provide remote access to lab materials. They also gained confidence by being able to review the material multiple times online. We conclude that blended resources are a useful tool in introductory petrology which we hope to see become more commonplace in the future.