THE MINERALOGRAPHY OF THE FELDSPARS 203 
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Fic. 1.—Structural chemical formulas of single-, double-, and triple-ring organic 
compounds, illustrating structures that form solid solutions. 1. Benzene. 2. Thio- 
phene. 3. Pyrrol. 4. Pyridine. 5. Naphthalene. 6. Quinoline. 7. Anthracene. 
8. Carbozol. 
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