In a Catholic parish in Hobbs, New Mexico, a statue of the Virgin Mary has been "weeping."

Onlookers have gathered out of curiosity, and also for prayer and healing. The liquid on the statue has been found to be olive oil and balsam – the same mixture that is used for certain Catholic rituals after being blessed by a bishop.

Claims about supernatural phenomena, including weeping statues, have historically been common in Catholicism. A well-known example is the 

Miracles and Mary

Catholics believe Mary is the mother of Jesus Christ and, therefore, the mother of God.

Throughout Catholic history, supernatural events have been attributed to Mary's power. When France's Chartres cathedral burned, only Mary's relic – called "The Veil of the Virgin"– survived after being safeguarded by three priests who were miraculously preserved from the heat and flames.

Mary's intercession is also believed to have ensured victory at the Battle of Lepanto in 1571, when an Ottoman fleet was repulsed by the forces of Genoa, Venice and the papacy.

Mary's tears have special significance for Catholics: She cries not only over the sins of the world, but also over the pain she endured in her earthly life, referred to as "the seven sorrows of Mary." These sorrows, which include the crucifixion and death of Jesus, are depicted by seven swords piercing Mary's flaming heart.

Even the flowery scent of olive oil and balsam evokes Mary since she is called "the rose without thorns."

It's not surprising for a weeping statue of Mary to become an object of prayer and devotion.

And when this happens, the local bishop sometimes steps in to investigate.

The possibility of trickery

In examining claims of the supernatural, bishops are guided by standards set by the Vatican's Congregation for the Doctrine of the Faith, which oversees Catholic doctrine. These standards primarily concern reports of "apparitions" of the Virgin Mary. But the framework also applies to other supernatural occurences, including weeping statues. Perhaps because they address controversial issues, the standards were only made public in 2012 – nearly 35 years after they were first implemented.

The bishop, or a committee appointed by him, evaluates the supernatural phenonmenon's impact on the community. Positive aspects can be healings and conversions, or even a more general deepening of faith among Catholics. Negative aspects would include sinful acts such as selling oil from a weeping statue or making claims contrary to Catholic doctrine.

One of the primary questions is whether the event has been staged. For example, in two cases of statues that wept blood – one in Canada in 1986 and another in Italy in 2006 – the blood turned out be that of the statue's owner.

Liquids can be injected into the porous material of statues and later seep out as "tears." Oil that is mixed with fat can be applied to a statue's eyes, which will "weep" when ambient temperatures rise in the chapel.

In the case of the bronze statue of Mary in Hobbs, New Mexico, the investigation has uncovered no such trickery. But the fact that no cause has yet been found does not mean that a miracle has taken place.

The Catholic Church rarely endorses weeping statues and similar phenomena. Usually, a bishop or the Vatican will only go as far as saying that faith and devotion are more important than tales of supernatural happenings.

Searching for meaning

While understanding the phenomenon, it's also important to appreciate the stories and individual motivations that people bring when they pray or worship in the presence of a statue that seems to weep.

In my hometown of Worcester, Massachusetts, for example, statues and pictures have wept oil and blood at the home of the late Audrey Santo, who died in 2007 at the age of 23. As a child, "Little Audrey," as she is still called, was left mute and paralyzed after a swimming pool accident. In spite of her physical condition, she was believed to pray for those who made pilgrimages to see her. After her death, a foundation was established to promote her cause for sainthood. The statues and pictures weeping in her home were seen as signs that God had specially blessed Little Audrey's life of suffering.

In my writings about the case of Audrey Santo, I was tempted to focus on the stories of supernatural wonders. And the claims surrounding Little Audrey are still hotly debated. In the end, I thought it would be more interesting to study how people find meaning in phenomena like weeping statues.

At the Santo home, the people I talked to shared moving personal stories of pain and sadness, hope and healing. The sense of togetherness in and through suffering was far more important than talk of miracles.

In Worcester – as well as in Hobbs, New Mexico – I expect what is going on is much more than superstition.

Mathew Schmalz, Associate Professor of Religion, College of the Holy Cross

This article was originally published on The Conversation. Read the original article. Follow all of the Expert Voices issues and debates — and become part of the discussion — on Facebook, Twitter and Google +. The views expressed are those of the author and do not necessarily reflect the views of the publisher. This version of the article was originally published on Live Science.