Spotlight on: Stone Analysis Essentials

American Glass Research (AGR) is proud to offer our newest seminar, “Spotlight on: Stone Analysis Essentials”.  AGR’s “Stones in Glass: Analysis and Identification” in-person seminar has trained glass industry professionals for over 10 years in this specialized skill. To introduce practical stone analysis to a broader audience, we are offering a shortened version of this seminar that will be useful for glass plant QC employees, batch & furnace workers, and some filling line QC personnel.

This new, 1.5-hour training seminar focuses on visual identification of stones using simple tools available in every QC lab – a hand lens and an optical microscope. First, the sources of stones will be reviewed, followed by a discussion of stone analysis equipment. Then, the physical characteristics observable at moderate magnifications will be surveyed. Finally, the distinctive visual traits of 19 of the most common stone types will be shown. Using the material in this course, trainees will be equipped to identify the majority of stones found in commercial glass products and to address their root causes.

CONTACT US If you have any questions: 

Topics to be covered

  • Introduction to stones in glass

  • Stone sources

  • Stone analysis tools

  • Visual characteristics of stones

  • 19 common stone types

  • Root cause determination

  • Difficult stones and next steps

Seminar Instructor

Senior Scientist

Brandon Aldinger

Brandon joined American Glass Research in 2015, where his areas of responsibility include fracture diagnosis, stone identification, pharmaceutical services, and internal research. He has published multiple technical papers on the optical and mechanical testing of laminated glass systems and on the surface chemistry of silicon. Brandon obtained his B.S. in Chemistry at Penn State University and went on to earn his Ph.D. in Physical Chemistry from Cornell University. Previously, he spent five years as the Materials Scientist at Ibis Tek, LLC, where he designed bullet-resistant glass products and supervised an ISO 17025-certified testing laboratory.

Course curriculum

  • 1


    • Stone Analysis Essentials Introduction

    • Course Layout and How to Receive Your Certificate

  • 2

    Section 1 - Stone Basics

    • Introduction to Stones

    • Sources

    • Analysis Tools

    • Visual Traits

  • 3

    Section 2 - Visually Identifiable Stones

    • Stone Catalog (Part 1)

    • Stone Catalog (Part 2)

    • Summary

  • 4

    Final Quiz

    • Final Quiz

    • AGR Survey

Need a hard copy?

Contact us to purchase hard copies of the PowerPoint slides for $75.

Interested in purchasing a paper binder of the PowerPoint slides? Reach out to us and mention "Stone Analysis Essentials hard copies" and we will ship the slides directly to you.

Learn even more with our "Color Atlas of Stones in Glass"

COURSE SPECIAL: purchase the webinar and receive a discount!

Students can contact Linda Pilosi ( to receive a 33% discount on our color atlas upon purchase. Discounted price is $100 plus shipping.