Why This Taiwan Cafe Serves Coffee With Stones At The Bottom

Ever taken a sip of your pour-over, savored the clean body and then reached the bottom of the cup to find something unexpected—like a small stone? You’re not alone. One café on Taiwan’s east coast has gained attention not for serving exceptional brews alone, but for serving them with a literal rock at the bottom. But before you call it a mistake, there’s more to the story.

No, the barista didn’t forget to clean the filter. The stone isn’t a mistake—it’s maifanite, intentionally added to improve your cup of coffee.

What Is Maifanite And Why Is It In Your Coffee?

Maifanite, also known as maifan stone, is a naturally occurring volcanic mineral rock. Its name comes from the tiny white dots scattered across its surface, resembling grains of rice—hence the nickname. Scientifically, it’s classified as porphyritic andesite. This stone is not just decorative; it plays an active role in coffee brewing.

The café in question, Jinzun Café, located in Taiwan’s East Coast Jinzun Recreation Area, adds these stones directly into the brewing vessel when making their signature single-origin coffee. The stones aren’t just for show—they help clarify and soften the brew. Customers report that coffee served this way tastes less bitter and more balanced, with a smoother mouthfeel and a neutral flavor profile that lets the coffee’s origin characteristics shine through.

How Does Maifanite Change The Taste Of Coffee?

Maifanite acts similarly to certain water filtration media. According to the café owners, the stone naturally purifies the water used in brewing by reducing impurities that can amplify bitterness or harsh acidity in coffee. This results in a cleaner cup that feels rounder on the palate. Many who try it note the reduced perceived acidity and a more mellow extraction, without any astringent or overly sharp edges.

Unlike traditional filtration methods that occur before water touches the coffee grounds, the stones work interactively during the brew. They don’t filter in the conventional sense but instead subtly alter the water chemistry as it interacts with both stone and coffee. This leads to a gentler extraction, muting overbearing flavors while preserving sweetness and balance.

How The Café Uses Maifanite In Brewing

Not every coffee on the menu gets the stone treatment. Only those specifically labeled as "maifanite coffee" include the stone. The café uses it solely with single-origin brews, where clarity of flavor is paramount. The maifanite stones are reused for about 2–3 months before they are removed, sun-dried, and “reactivated” to restore their filtering capabilities. Each stone has an estimated functional lifespan of around five years with proper care.

During service, the stone is placed directly in the brewing vessel, often visible at the bottom once the coffee has been poured. It doesn’t interfere with pouring technique or extraction time, and customers are usually alerted to its presence either by sight or by the café staff. The stones are small enough that they pose no risk if accidentally swallowed—though that’s not encouraged—and they remain at the bottom of the cup as a reminder of the unique brewing method.

Other Uses For Maifanite Beyond Coffee

Jinzun Café doesn’t limit maifanite to just brewing coffee. The shop also sells small maifanite planters—decorative pots made from the same volcanic stone. These are marketed as aids for indoor gardening. The porous nature of the rock helps regulate soil moisture, preventing waterlogging and promoting healthier root environments for houseplants. Priced affordably at around 200 Taiwanese dollars (approximately $6 USD), these mini planters have become a secondary draw for visitors.

The café itself is situated beneath a vine of large purple Dendrobium orchids, offering a stunning view of the clear blue ocean—a perfect rest stop along the scenic East Coast. The combination of natural beauty, unique brewing techniques, and functional stone accessories makes it a memorable stop for travelers and coffee enthusiasts alike.

Frequently Asked Questions

Is it safe to drink coffee that has a stone in the bottom of the cup?

Yes, the maifanite stone used in the Jinzun Café coffee is safe. It is a natural volcanic mineral rock, and customers are not meant to consume it—but its presence at the bottom of the cup is not hazardous. The stone remains intact throughout the brew and poses no health risk if accidentally touched or seen.

What does maifanite do for coffee flavor?

Maifanite helps clarify the brewing water, which reduces bitterness and acidity in the final cup. Customers report a smoother, more balanced flavor with less perceived sharpness. It doesn’t add taste but alters the water chemistry to produce a cleaner extraction.

Do all drinks at Jinzun Café come with a stone?

No, only coffees specifically labeled as "maifanite coffee" include the stone. It is not added to other beverages or standard coffee brews on the menu. The stone is used to enhance single-origin coffee profiles.

How long can you use maifanite stones for brewing?

The café reuses the stones for approximately 2–3 months before placing them in sunlight to restore their effectiveness. Each individual stone can last up to 5 years with proper care and periodic reactivation.

Can I buy maifanite stones for home brewing?

The article doesn’t specify availability for purchase outside the café, but Jinzun Café does sell maifanite planters. The stones themselves are part of the café’s unique brewing process and may not be officially sold as standalone brewing tools.

Are maifanite planters effective for plants?

Yes, according to the café, maifanite planters help regulate soil moisture and prevent waterlogging, making them suitable for indoor potted plants. They are sold as a gardening aid alongside the café’s specialty coffee offerings.

Recommended FrontStreet Single Origins for Stone-Brewed Coffee

For coffee lovers intrigued by the clean, balanced profile achieved with maifanite stones, try FrontStreet’s Ethiopia Humbera—bright with citrus and floral notes—or their Yirgacheffe, known for delicate jasmine and lemon zest. Both single origins showcase the kind of clarity enhanced by filtered or mineral-altered water. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.