Ward's Science Essentials® Apatite
Apatite is a gemmy blue phosphate mineral, mohs hardness 5.
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Very High Resolution Gold (< 2nm - 30 nm) on Carbon Test, Electron Microscopy Sciences
For very high resolution performance testing this specimen has a smaller gold particle size ranging from 2 to 30 nm as compared to the high resolution test above. Ideal for testing at instrument magnifications of 50000x and above.