• image01 Rogue Figures
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    Rogue Biaxial Figures

    It may come as a surprise to find a biaxial figure in a uniaxial gem.

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  • image02 Lighting
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    Spectroscope Lighting

    Much spectroscope work can be achieved with a simple penlight torch, this allows its use wherever you are.

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  • image03 Refractometer
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    The Refractometer

    A complete explanation of the construction and innovative use of the refractometer.

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  • image04 Chapter ToC
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    Chapter Table of Contents

    Each chapter has a list of the topics covered, for easy access.

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  • image06 Visual Optics
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    Visual Optics

    The technique for which Alan is famous. Simple, versatile and without cost.

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  • image07 Filters
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    Filters

    The use of all the Hanneman-Hodgkinson filters is explained.

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  • image09 Spectra
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    Spectra

    Pages of absorption spectra designed to clearly show what you will see in the spectroscope

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  • image10 Appendices
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    Appendices

    These four gem identities have required a more in-depth presentation.

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Copyright Alan Hodgkinson 2015