The U-shaped platform, which is attached to the side of a cliff face on Yuntai Mountain, Henan Province, has now been closed for repairs.
A woman shared photos on Weibo, a Chinese social media site, of what she claimed was the cracked glass.
She also posted a message, which reads: “[I’ve] just witnessed history. The glass-bottomed walkway on Yuntai Mountain just cracked. When I was about to reach the end [of the passage], I heard a sudden bang and felt a shake under my feet.
“I looked down and saw the glass floor beneath me shattered. [I have] no idea why it happened, at that moment everybody was screaming.
“I yelled out loud, “It cracked, it really cracked!, then pushed the people in front of me to leave. [I was] terrified.”
The Weibo post has now been removed by the 20-year-old woman, as she said she had received too much attention.
The 68m platform, which opened in September, is suspended more than 1,000m above sea-level.
The walkway, at Yuntai Mountain Geological Park in Henan Province, China, cracked at around 5pm on Monday afternoon, causing panic among visitors.
Speaking to People’s Daily Online, a spokesperson for the Yuntai Mountain tourism bureau explained that the cracks happened after a tourist dropped a stainless steel mug on the walkway.
The cracks resembled “winter frost on a window pane”.
However, it was only one of three layers of glass that broke, so the tourists were not in too much danger, the spokesperson said.
The glass is supposedly capable of supporting up to 800kg (1,763 pounds) per square metre, they said.
The walkway has been closed until further notice.