Calcium Oxalate Dihydrate crystals are characterized by their:

Calcium Oxalate Dihydrate crystals are indeed characterized by their colorless appearance. These crystals typically appear as small, colorless or translucent and can sometimes resemble envelopes or squares under the microscope. Their colorless nature can often make them more challenging to identify compared to other urinary crystals that might have distinct colors.

While he presence of these crystals is primarily associated with acidic urine, they can also be found in neutral and even slightly alkaline urine, which means that the acidity of the urine does not exclusively define their presence. The long and pointed ends of certain crystal types may describe other crystals, such as struvite, and do not pertain to Calcium Oxalate Dihydrate. Similarly, the characteristic of having many lines radiating from the center is associated with different types of crystals, such as cholesterol crystals, rather than Calcium Oxalate Dihydrate.

Thus, the defining feature of Calcium Oxalate Dihydrate crystals is their colorless appearance, which is essential for identification in clinical pathology.