The exact designation "黑砂水平壶" is a little ambiguous without maker or region details — literally "black-sand shuiping teapot" — but it most likely refers to a dark clay teapot in a low, horizontally oriented form. Below is a concise, safe description and context.

Description / brief history:
Black-clay (黑砂, often a dark variant of Zisha or other regional clays) teapots belong to the broader tradition of Chinese artisanal teaware centered on Yixing-style stoneware. Teapots made from Zisha and related clays were developed and refined from the Ming into the Qing dynasty and became prized for their ability to season tea and to enhance aroma. Dark or black clays have been used alongside purple and red clays for centuries, offering a more solemn aesthetic and different surface textures. Skilled potters have historically adapted simple, functional shapes to suit gongfu tea practices and domestic use alike.

Note on the shape:
The term 水平 (shuǐpíng, “horizontal/level”) suggests a low-profile, laterally extended body — a squat, wide form that emphasizes a balanced silhouette. Such shapes typically pour steadily, heat evenly, and fit comfortably in the hand; the dark, fine-grained clay gives the piece a restrained, elegant presence suitable for everyday brewing and collecting.
Wood-fired handmade Yixing teapot made from Duanni clay sourced from the original Huanglongshan mine. Xu Shun Wei.