Author Archive: judy

Few localities have yielded the number of diverse Pyrite crystal forms known to occur at Duff’s. Some of the crystal forms which can be readily observed at Duff’s Quarry, generally in combination, include trapezohedral, diploidal, octahedral, cubic, pyritohedral and dodecahedral….
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Scalenohedral crystals occur in both generations of calcite but are less common from the 2nd generation. Scalenohedrons from the 2nd generation have similar physical properties as the more complex crystals, but are generally much smaller. The photo to the left…
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Dolomite CaMg(CO3)2 and Ferroan Dolomite Ca(Fe2+,Mg)(CO3)2 The main constituent of Western Ohio sediments, Dolomite is one of the most common minerals found in the State. The dolomitic limestones, in Ohio, which are actively quarried for aggregate and lime needs are…
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The most uncommon mineral known to exist in geodized brachiopods, from the Georgetown area, is Barite. In fact, good Barite crystals from the State of Ohio, are extremely difficult to find. Barite, a sulfate similar to Celestine, has been observed…
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