Raw Phyllite Metamorphic Rock Hand Sample, Labeled for Geology Classroom, Approx 3 inch Subcategory_Geology Models lock-screw

lock-screw

Accuracy using factory calibration:

the doubled-apex prism producing about twice the deviation of the 5° unit while still in the small-angle regime

ASTM E288 Class A volumetric flask in durable borosilicate glass holds 5mL with polyethylene stopper for precision volumetric measurement

a step up from the 70mm model with extended pole separation that gives field-mapping experiments more room along the magnet axis

Raw Phyllite Metamorphic Rock Hand Sample, Labeled for Geology Classroom, Approx 3 inch Subcategory_Geology Models lock-screwPhyllite hand sample measures 3 inches with silky sheen and wavy foliation representing low grade metamorphism of shale for metamorphic grade teaching.